SRP1-CRAZL-050TC-N

**Solid State Relays** SRP1–CR 

High-Endurance Solid-State Relay 

## **Description** 

The SRP1-CR High-Endurance series are multipurpose SSRs that come with everything you need to ensure better uptimes, while allowing a fast, safe and easy installation: 

- Overvoltage protection is ensured through the use of Littelfuse SMBJ Series TVS Diodes, inside, for overvoltage protection to safeguard the relay’s operation even in the event of electrical spikes within the network. 

- The IP20 plastic cover provides finger-safe protection for the user by preventing accidental contact with live terminals. 

- A pre-attached Thermal Pad eliminates the need for thermal paste application, ensuring an easy and clean installation with efficient heat dissipation. 

Using the latest manufacturing techniques in Direct Bonding Technology and featuring high-end power semiconductors (Littelfuse proprietary IXYS Technology) this relay provides maximum quality, reliability, and longevity even under tough conditions compared to any other relay in the market. 

## **Features & Benefits** 

|FEATURES|BENEFITS|
|---|---|
|**High-Endurance Design**|Provides enhanced operational reliability and extended service life,<br>ensuring consistent performance even in demanding conditions|
||Incorporates IP20 finger-safe protection and overvoltage TVS|
|**Integrated Protection & Installation Features**|protection, along with a pre-attached thermal pad, facilitating|
||straightforward and secure installation|
|**Broad Application Spectrum**|Engineered to accommodate a diverse range of applications and load<br>types, offering flexibility and utility in various engineering projects|



## **Applications** 

- Heating and motion control in industrial automation 

- Industrial ovens & electronics production equipment 

- Plastic & packaging machinery 

- Air handlers and other HVAC equipment 

- Cooking ovens & hot drinks dispensers 

- Theatrical, public & traffic lighting control 

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©2024 Littelfuse, Inc. Specifications are subject to change without notice. Revised: 07/18/2024 

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**Solid State Relays** SRP1–CR 

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## **Ordering Information** 

## **FOR HEATING & LIGHTING CONTROL** 

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OUTPUT   OUTPUT   OUTPUT   OUTPUT OVERVOLTAGE  INPUT<br>CATALOG # COMPLIANCE<br>MAX CURRENT VOLTAGE SWITCHING STYLE PROTECTION VOLTAGE RANGE<br>SRP1-CRDZL-010TC-N 10 A 24-240 V AC Zero Cross TVS [3] 4-32 V DC c Я Uus, CE<br>SRP1-CRAZL-010TC-N 10 A 24-240 V AC Zero Cross TVS [3] 90-280 V AC c Я Uus, CE<br>SRP1-CRDZL-025TC-N 25 A 24-240 V AC Zero Cross TVS [3] 4-32 V DC c Я Uus, CE<br>SRP1-CRAZL-025TC-N 25 A 24-240 V AC Zero Cross TVS [3] 90-280 V AC c Я Uus, CE<br>SRP1-CRDZH-025TC-N 25 A 48-600 V AC Zero Cross TVS [3] 4-32 V DC c Я Uus, CE<br>SRP1-CRAZH-025TC-N 25 A 48-600 V AC Zero Cross TVS [3] 90-280 V AC c Я Uus, CE<br>SRP1-CRDZL-050TC-N 50 A 24-240 V AC Zero Cross TVS [3] 4-32 V DC c Я Uus, CE<br>SRP1-CRAZL-050TC-N 50 A 24-240 V AC Zero Cross TVS [3] 90-280 V AC c Я Uus, CE<br>SRP1-CRDZH-050TC-N 50 A 48-600 V AC Zero Cross TVS [3] 4-32 V DC c Я Uus, CE<br>SRP1-CRAZH-050TC-N 50 A 48-600 V AC Zero Cross TVS [3] 90-280 V AC c Я Uus, CE<br>**----- End of picture text -----**<br>


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FOR OTHER LOADS CONTROL<br>OUTPUT   OUTPUT   OUTPUT   OUTPUT OVERVOLTAGE  INPUT<br>CATALOG # COMPLIANCE<br>MAX CURRENT NOMINAL VOLTAGE SWITCHING STYLE PROTECTION VOLTAGE RANGE<br>SRP1-CRDRL-010TC-N 10 A 24-240 V AC Instantaneous [4] TVS [3] 4-32 V DC c Я Uus, CE<br>SRP1-CRARL-010TC-N 10 A 24-240 V AC Instantaneous [4] TVS [3] 90-280 V AC c Я Uus, CE<br>SRP1-CRDRL-025TC-N 25 A 24-240 V AC Instantaneous [4] TVS [3] 4-32 V DC c Я Uus, CE<br>SRP1-CRARL-025TC-N 25 A 24-240 V AC Instantaneous [4] TVS [3] 90-280 V AC c Я Uus, CE<br>SRP1-CRDRH-025TC-N 25 A 48-600 V AC Instantaneous [4] TVS [3] 4-32 V DC c Я Uus, CE<br>SRP1-CRARH-025TC-N 25 A 48-600 V AC Instantaneous [4] TVS [3] 90-280 V AC c Я Uus, CE<br>SRP1-CRDRL-050TC-N 50 A 24-240 V AC Instantaneous [4] TVS [3] 4-32 V DC c Я Uus, CE<br>SRP1-CRARL-050TC-N 50 A 24-240 V AC Instantaneous [4] TVS [3] 90-280 V AC c Я Uus, CE<br>SRP1-CRDRH-050TC-N 50 A 48-600 V AC Instantaneous [4] TVS [3] 4-32 V DC c Я Uus, CE<br>SRP1-CRARH-050TC-N 50 A 48-600 V AC Instantaneous [4] TVS [3] 90-280 V AC c Я Uus, CE<br>**----- End of picture text -----**<br>


## **Input/Control Specifications[1]** 

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GENERAL DATA<br>VALUE FOR DC  VALUE FOR AC<br>SYMBOL PARAMETER RANGE UNIT UNIT<br>INPUT VERSIONS INPUT VERSIONS<br>Maximum 32 V DC 280 V AC<br>Uc Input (Control) Voltage* Nominal 5 – 12 – 24  V DC 120 - 240 V AC<br>Minimum 4 V DC 90 V AC<br>Urv Reverse Voltage Maximum -32 V DC N/A V AC<br>Turn-On Voltage<br>Uc on Minimum 4.0 V DC 90 V AC<br>(Pick-up/Engage/Activation Voltage)<br>Turn-Off Voltage<br>Uc off Nominal 1.0 V DC 10 V AC<br>(Drop Out/Release/Deactivation Voltage)<br>Maximum 12 mA 7 mA<br>Ic Input (Control) Current<br>Minimum 7 mA 4 mA<br>- Input Impedance Nominal Current Regulated - Current Regulated -<br>- Turn-On Time Maximum ½   Cycle 20 (using nominal input  ms<br>(20 us for instant on) voltage range)<br>- Turn-Off Time Maximum ½ Cycle 30 ms<br>**----- End of picture text -----**<br>


*Limit Input voltage to 240 V AC above 40 °C Surrounding Ambient for AC Versions. 

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©2024 Littelfuse, Inc. Specifications are subject to change without notice. Revised: 07/18/2024 

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**Solid State Relays** SRP1–CR 

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## **Output/Load Specifications[1]** 

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GENERAL DATA<br>VALUE  VALUE  VALUE<br>SYMBOL PARAMETER CONDITION RANGE FOR 10A  FOR 25A  FOR 50A  UNIT<br>VERSIONS VERSIONS VERSIONS<br>- Output Configuration - - SPST-NO SPST-NO SPST-NO -<br>Minimum 47 47 47<br>f Operating Frequency - Nominal 50 – 60 50 – 60 50 – 60 Hz<br>Maximum 63 63 63<br>Minimum 24 24 24<br>For Low-Voltage<br>Ue Operating Voltage Nominal 120 - 240 120 - 240 120 - 240 Vrms<br>Versions<br>Maximum 280 280 280<br>Minimum 48 48 48<br>For High-Voltage<br>Ue Operating Voltage Nominal 400-600 400-600 400-600 Vrms<br>Versions<br>Maximum 660 660 660<br>Clamping Voltage  - Maximum 1200 1200 1200 Vpk<br>Uclamp<br>(TVS Overvoltage Protection Self-trigger) Minimum 900 900 900 Vpk<br>V On-State Voltage Drop At Rated Current Maximum 1.15 V 1.15 V 1.3 V Vrms<br>Vto Threshold Voltage   Tvj = 150 °C Maximum 0.88 0.88 0.88 V<br>(Power Loss Calculations only)<br>rt On state dynamic resistance   Tvj = 150 °C Maximum 6.3 6.3 6.3 mΩ<br>(Power Loss Calculations only)<br>Up Transient Over-Voltage  - Maximum 1200 1200 1200 Vpk<br>(Peak/Blocking/Non-Repetitive Voltage)<br>Transient Over-Current 1/2 Cycle At 50/60<br>Itsm Maximum 220/260 420/460 620/660 Apk<br>(Surge/Overload/Non-Repetitive Current) Hz (Tvj=45 °C)<br>Ilk Leakage Current (Off-State) At Rated Voltage Maximum 1 1 1 mArms<br>At Maximum<br>dv/dt Critical dV/dt (Off-State) Minimum 500 500 500 V/µsec<br>Rated Voltage<br>I²t I²t Value for Fusing ½ Cycle at 50/60Hz  Minimum 800/900 1200/1300 1800/1900 A² sec<br>(Tvj=45 °C)<br>Pf Minimum Power Factor At Maximum Load Minimum 0.5 0.5 0.5 -<br>- Thermal Resistance Junction to Case (Rjc) 1.0 0.8 0.5 °C/W<br>**----- End of picture text -----**<br>


Littelfuse SSRs are versatile and can handle different types of loads, such as light, motors, and others. However, the maximum continuous current value given in this datasheet is only for resistive loads (specifically AC-1 type), which are mainly used for heating control. 

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VALUE FOR 10A  VALUE FOR 25A  VALUE FOR 50A<br>SYMBOL PARAMETER CONDITION RANGE UNIT<br>VERSIONS VERSIONS VERSIONS<br>Ie  Load Current (Continuous) –  Maximum 10 25 50 Arms<br>At 40 °C<br>(AC-51) Heating Elements (AC-1) Minimum 0.15 0.15 0.15 Arms<br>**----- End of picture text -----**<br>


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**Solid State Relays** SRP1–CR 

## **Thermal Derating Curves (for heatsink selection)** 

To operate the Solid-State Relay (SSR) at its specified ratings, the use of a heatsink is mandatory. The following thermal derating curves illustrate the maximum load current that our SSRs can manage under varying ambient temperatures and heatsink sizes. It is crucial to select a heatsink that is most suitable for your specific application. 

## **10A VERSIONS:** 

## **25A VERSIONS:** 

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6<br>**----- End of picture text -----**<br>


**50A VERSIONS:** 

## **Considerations - Switching Type** 

In applications requiring precise temperature management, solid-state relays (SSRs) play a crucial role. Specifically, the Zero Cross Switching type of SSR is commonly employed to regulate heaters based on signals from a temperature controller. This technology proves particularly valuable in scenarios where high-frequency switching occurs—such as when a heater cycles on and off frequently over short intervals for extended periods. 

## **Considerations - Inrush Current** 

It’s essential to recognize that variations exist between different types of heating elements, especially in hot or cold conditions. While it is generally expected that heating elements exhibit no inrush current, in certain heating elements cold conditions can lead to an inrush current equivalent to 1.4 times the nominal current. To mitigate this, we highly recommend oversizing the current rating and ensuring an appropriately sized heatsink. Doing so improves the relay’s thermal endurance and extends its operational lifespan. 

So, when selecting an SSR, consider using one with a capacity approximately 1.4 times that of the heater or operating the SSR at only 75%-80% of its maximum capacity. The following table provides guidance for choosing the right SSR for a specific heater load. 

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|---|---|---|---|---|---|---|
|NOMINAL SSR|MAXIMUM RECOMMENDED|HEATER POWER|HEATER POWER|HEATER POWER|HEATER POWER|HEATER POWER|
|CURRENT RATING|HEATER CURRENT|AT 120 VAC|AT 240 VAC|AT 400 VAC|AT 480 VAC|AT 600 VAC|
|10 A|8 A|960 W|1.9 KW|3.2 KW|3.8 KW|4.8 KW|
|25 A|20 A|2.4 KW|4.8 KW|8.0 KW|9.6 KW|12.0 KW|
|50 A|40 A|4.8 KW|9.6 KW|16.0 KW|19.2 KW|24.0 KW|

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**Littelfuse.com** ©2024 Littelfuse, Inc. Specifications are subject to change without notice. Revised: 07/18/2024 

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## **General Specifications[1]** 

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GENERAL DATA<br>SYMBOL PARAMETER CONDITION RANGE VALUE  UNIT<br>- - - Continuously ON Green LED,  -<br>LED for Input (Control) Status Indicator<br>when control input is applied<br>Ui Isolation (Dielectric Strength) Input/Output/Base 50/60 HZ Nominal 4 000 Vrms<br>Ri Insulation Resistance @ 500 V DC Minimum 1 GΩ<br>- Coupling Capacitance - Maximum 8 pF<br>- Endurance* according to American Standard UL508 Typical 100,000 Cycles<br>**----- End of picture text -----**<br>


*The SRP1 series is engineered for durability, having undergone rigorous testing to ensure a minimum lifespan of 100,000 Endurance cycles, with each cycle consisting of a 1-second activation followed by a 9-second rest, at twice the rated current. This means that the relay can be expected to operate reliably for 100,000 times under these conditions, but it may have a shorter or longer lifetime depending on other factors, such as switching frequency, environmental temperature, and humidity. 

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ENVIRONMENTAL DATA<br>SYMBOL PARAMETER CONDITION RANGE VALUE  UNIT<br>Vibration<br>- (Test conducted in accordance with the Vibration Environmental  5-100Hz Nominal 10 g<br>Testing Guidelines of the International Standard  IEC 60068-2-6)<br>Shock<br>- (Test conducted in accordance with the Shock Environmental  11ms Nominal 50 g<br>Testing Guidelines of the International Standard  IEC 60068-2-27 )<br>Maximum 70 (158) °C (°F)<br>-<br>Ambient Temperature - Operating (Working) [7] No icing, no condensation<br>Minimum -40 (-40) °C (°F)<br>Maximum 100 (212) °C (°F)<br>-<br>Ambient Temperature - Storage No icing, no condensation<br>Minimum -40 (-40) °C (°F)<br>HR Relative Ambient Humidity   Non-condensing @ 40 °C Nominal 93 %<br>(Per international standard  IEC/EN 60068-2-78 )<br>- Pollution Degree Non-conductive pollution with  Nominal 2<br>condensation possibilities<br>**----- End of picture text -----**<br>


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MECHANICAL DATA<br>SYMBOL PARAMETER CONDITION RANGE VALUE UNIT<br>- Product Weight - Typical 100 (0.22) g (lbs)<br>Housing Material<br>- (In accordance with the American Standard UL- - - Plastic UL 94 V-O -<br>94 for Safety of Flammability of Plastic Materials<br>for Parts in Devices and Appliances)<br>- Baseplate Material - Aluminum -<br>Touch Protection Level<br>(Test conducted in accordance with the IP Code<br>IP20<br>of Degrees of Protection Testing Guidelines of<br>the International Standard  IEC 60529 )<br>1.5-1.7  Nm<br>Input Terminals Typical<br>(13-15) (in-lb)<br>- 2-2.2  Nm<br>Screw Torque Range Output Terminals Typical<br>(18-20) (in-lb)<br>2-2.2  Nm<br>SSR Mounting Typical<br>(18-20) (in-lb)<br>Input Terminals - M4 x 0.7 -<br>- Screw Thread Size Output Terminals - M5 x 0.8 -<br>- M4 x 0.7 or #8-32 Pan  -<br>SSR Mounting<br>Head<br>**----- End of picture text -----**<br>


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**Solid State Relays** SRP1–CR 

## **Product Dimensions** 

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1.77 — 44.9<br>OVERALL<br>I|fof |<br>Soe<br>—=<br>.177 4.50<br>- | S MOUNTING HOLE/SLOT °o [ ]<br>Lo<br>| |<br>Hee ee<br>57.62.27 OVERALL 47.501.870<br>29.31.15 OVERALL<br>**----- End of picture text -----**<br>


## Wiring Diagrams 

## Equivalent Circuit Block Diagrams 

## **Short-Circuit Protection by Fuse** 

To safeguard solid-state relays (SSRs) against load short circuits, the use of fuses is essential, especially fast-acting ones. Here are the key considerations: 

- Fuse Selection: The I²t value (energy withstand capability) of the fuse should be less than half of the I²t value of the relay. Standard fuses are inadequate because they cannot react swiftly enough to prevent fault currents from exceeding the maximum levels that thyristors (used in SSRs) can handle. Therefore, we strongly recommend employing ultra-fast fuses. 

- Fuse Placement: Position the fuse in front of the SSR in the circuit. This strategic placement ensures that if the relay must unexpectedly break the earth insulation (due to overheating, case damage, or leakage with the heatsink), the fuse will protect the entire circuit from firing. 

- Resource for Fuse Options: For the most suitable fuse options, consider checking the **Littelfuse website.** 

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**Solid State Relays** SRP1–CR 

## **Standards Conformity & Certifications** 

## Product Safety Certifications 

Products tested, compliant and certified to the following standards that states the requirements for electrical products to ensure they are safe for consumers to use. 

|CERTIFICATION<br>BODY MARK|CERTIFICATION<br>BODY NAME|CERTIFICATION<br>DESCRIPTION|STANDARDS COVERED BY THE CERTIFICATION|
|---|---|---|---|
|No. E183688<br>cAkis|cЯUus|North American certificate of<br>compliance with the Safety<br>requirements for Industrial<br>Control Equipment|**UL508**<br>American Standard of Safety for Industrial Control Equipment.<br>**CAN/CSA**<br>**C22.2 No.14-18**<br>Canadian Standard of Safety for Industrial Control Equipment.<br>6<br>Sh.|
|CE|CE|Conformity with the<br>European safety, health, and<br>environmental protection<br>requirements.|**LVD Directive**<br>**2014/35/EU**<br>EU Directive of Safety for Low Voltage Gear Equipment.<br>In accordance with the Low Voltage Gear Testing Guidelines of the International Standard IEC 60947-4-3<br>**EMC Directive**<br>**2014/30/EU**<br>EU Directive of Electromagnetic Compatibility.<br>In accordance with the Low Voltage Gear Testing Guidelines of the International Standard IEC 60947-4-3<br>**RoHS Directive**<br>**2015/863/EU**<br>EU Directive of Hazardous Substances Restriction.<br>In accordance with the Assessment of electrical and electronic products with respect to the restriction of<br>Hazardous substances Guidelines of the International Standard IEC 63000|



## **EMC Compliance (Electro-magnetic compatibility)** 

## **Radiated Emissions** 

|-|STANDARD NAME|STANDARD DESCRIPTION|STANDARD NUMBER|LEVELS|
|---|---|---|---|---|
||Radiated RF|Radio interference field emission (radiated)|International Standard CISPR 11|Class B: 30M – 1GHz|
||Conducted RF|Radio interference voltage emissions (conducted)|International Standard CISPR 11|Class B (with external filter): 150k – 30MHz|



## **Immunity** 

|-|STANDARD NAME|STANDARD DESCRIPTION|STANDARD NUMBER|LEVELS|
|---|---|---|---|---|
||ESD<br>~~a~~|Immunity to Electrostatic Discharge (ESD)|International Standard IEC 61000-4-2|Level 3<br>-Contact Discharge: 6 kV<br>-Air Discharge: 8 kV|
||Radiated RF<br>~~a~~<br>~~eeee~~|Immunity to Radiated Radio Frequency<br>~~ee~~|International Standard IEC 61000-4-3<br>~~ee~~|-Level 3:<br>10 V/m (80MHz-2GHz)<br>-Level 2<br>3 V/m (2GHz-6GHz)|
||Burst<br>~~eeee~~<br>~~es~~|Immunity Electrical Fast Transients (Burst) International Standard IEC 61000-4-4<br>~~ee~~|Immunity Electrical Fast Transients (Burst) International Standard IEC 61000-4-4<br>~~ee~~|Level 3: 2 kV|
||Surge<br>~~eeee~~<br>~~es~~|Immunity to Electrical Surges<br>~~ee~~|International Standard IEC 61000-4-5<br>~~ee~~|Level 3:<br>-Line to line: 1 kV<br>-Line to ground: 2 kV|
||Conducted RF<br>~~es~~<br>~~a~~|Immunity to Conducted Radio Frequency<br>|International Standard IEC 61000-4-6<br>|Level 3: 10V/m (0.15 - 80 MHz)|
||Dips<br>~~a~~|Immunity to Voltage Dips<br>|International Standard IEC 61000-4-11<br>|-0% for 0.5, 1 cycle, Performance Criteria A<br>-40% for 10/12 cycles, Performance Criteria A<br>-70% for 25/30 cycles, Performance Criteria A<br>-80% for 250/300 cycles, Performance Criteria A|
||Interruptions<br>~~ef~~|Immunity to Voltage Interruptions<br>~~ef~~|International Standard IEC 61000-4-11<br>~~ef~~|0% for 250/300 cycles, Performance Criteria B|



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**Solid State Relays** SRP1–CR 

## **Environmental Compliance[5]** 

Products comply to the following environmental standard requirements for electrical products to ensure they are safe for consumers to use. 

|**Environmental Compliance[5]**<br>Products comply to the following environmental standard requirements for electrical products to ensure they are safe for<br>consumers to use.|**Environmental Compliance[5]**<br>Products comply to the following environmental standard requirements for electrical products to ensure they are safe for<br>consumers to use.|
|---|---|
|-<br>STANDARD NAME<br>STANDARD DESCRIPTION<br>STANDARD NUMBER<br>RoHS<br>Conformity with the European Restriction of Hazardous Substances in<br>electrical and electronic products<br>European Directive 2015/863/EU (IEC 63000)<br>REACH<br>Conformity with the Registration, Evaluation, Authorization and Restriction<br>of Chemicals regulation to ensure safe use of chemicals<br>European Directive 1907/2006<br>~~——————E~~||
|Notes:||
|1. All parameters at 25 °C unless otherwise specified.||



2. CE declared up to 480 V. 

3. TVS protected output will self-trigger between 900-1200 Vpk. 

4. Instantaneous turn-on version is not recommended for incandescent lamp (Tungsten) and capacitive loads. Use zero turn-on only. 

5. The environmental compliance data reflects the most current information available and adheres to our rigorous standards for quality and sustainability. These specifications are valid from the product’s initial release and are subject to change with ongoing improvements. 

6. If no heatsink is used then the baseplate has to be exposed to free ambient air. 

7. AC input option minimum operating temperature is -20 (-4). 

## **Warning Information** 

**Caution: Material Damage, Electric Shock, and Arc Flash Hazard.** Before installing or working with this equipment, take the following precautions: 

> 1. **Disconnect all power:** Ensure that all power sources are disconnected. 

> 2. **Verify connections:** Double-check all connections. 

> Failure to adhere to these instructions may lead to **serious injury or damage** of equipment. 

**Disclaimer Notice –** Information furnished is believed to be accurate and reliable. However, users should independently evaluate the suitability of and test each product selected for their own applications. Littelfuse products are not designed for, and may not be used in, all applications. Read complete Disclaimer Notice at **www.littelfuse.com/product-disclaimer.** 

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