FB-2

## **User’s Guide** 

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## **SSRL240/SSRL660 SERIES Solid State Relays** 

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It is the policy of OMEGA to comply with all worldwide safety and EMC/EMI regulations that apply. OMEGA is constantly pursuing certification of its products to the European New Approach Directives. OMEGA will add the CE mark to every appropriate device upon certification. The information contained in this document is believed to be correct, but OMEGA Engineering, Inc. accepts no liability for any errors it contains, and reserves the right to alter specifications without notice. **WARNING:** These products are not designed for use in, and should not be used for, patient-connected applications. 

## **PRECAUTIONS** 

A number of essential safety precautions must be observed in the installation and use of a Solid State Relay (SSR). 

The SSRs should be installed and serviced by qualified technicians familiar with high voltage and current circuits. Note that an SSR has a small leakage current when the contacts are “open”. Normal failure condition is contacts “closed”. A special Fast Blowing I[2] T fuse and a mechanical interrupt switch are recommended in the load circuit. In certain applications a mechanical interrupt switch should be installed in the control circuit. 

## **GENERAL DESCRIPTION** 

The Omega[®] Solid State Relays (SSR’s) are a series of single-pole, normally open, solid state switching devices with no moving parts, capable of tens of millions of cycles of operation. It is designed to control 120V, 240V or 480V (up to 660V) alternating current (VAC), and provides zero voltage switching and 2500VAC isolation between the load terminals and the control signal. A control signal (AC or DC input, depending on unit selected) causes the SSR to switch the ac load ON or OFF just as a conventional mechanical contact switch does but with none of the problems associated with moving contact relays, such as corrosion, pitting, arcing, radio frequency interference (RFI) and bounce. The result: much longer life for the SSR. 

The SSR is designed around a pair of SCR’s mounted on a heat-spreading metal base to eliminate thermal fatigue failures. To dissipate the heat developed naturally in an SSR due to a nominal voltage drop across the device, the SSR must be mounted on a Finned Heat Sink (FHS), or on a metal plate of adequate size (see Section 4). It is advisable to install an SSR where the ambient temperature is relatively low because its current-switching rating is decreased as its temperature increases. 

Control resistance heaters up to 40 kW use solid state relays in conjunction with lower-rated temperature controllers. Three-phase loads can be controlled using 2 or 3 SSR’s. Use 3 SSR’s for Y-phase loads using a neutral line. Three solid state relays are also used when there is no neutral load to provide redundancy and extra assurance of control. Two SSRs will control “delta” loads with no neutral line. 

1 

## **FINNED HEAT SINKS (FHS)** 

The Finned Heat Sinks (FHS) are anodized, aluminum fabrications which come complete with tapped mounting holes, and screws to mount the SSR. 

## **FHS-1 and FHS-2 Heat Sink** 

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A<br>2.000" 0.167" B<br>2.000" 8-32 TH'D 4.750"<br>4.416" 2 Places<br>0.200"<br>0.062 0.250" 1.875" 0.125" R<br>DIMENSIONS IN INCHES C<br>THERMAL<br>A B C RATING<br>FHS-1 3.00" 2.50" 0.56" 2°C/W<br>FHS-2 5.50" 5.00" 1.81" 1.2°C/W<br>**----- End of picture text -----**<br>


**FHS-1 - FHS-2 Heat Sink** 

## **FHS-6 Heat Sink (0.7°C/W Thermal Rating)** 

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SSR MOUNTING HOLES (2) 8-32 THDS.<br>5.50<br>2.62 4.50 0.50<br>4.56<br>CENTERS<br>CL 4.75 CL SCREWS#6<br>1.44 1.87 1.81<br>0.218 0.20<br>END VIEW (TYP.) (TYP.) TOP VIEW<br>**----- End of picture text -----**<br>


**FHS-6 Heat Sink** 

2 

## **FUSE PROTECTION** 

The load side of the SSR should be protected by a Fast-Blowing I[2] T fuse. Recommended fuses and part numbers are given in below. Although a semiconductor relay is designed for virtually countless operation cycles, it can be destroyed by an over-voltage or a short circuit, unless protected adequately by the fast fuse. 

Table 3-1 shows the part numbers of the fuses and fuse blocks that can be used with each of the SSRs. Lower rated fast-blow fuses should be used if the current being controlled is below the rated capacity of the SSR. Bussman or equivalent fuses should be used. It is essential that a proper fast-blow (I[2] T) fuse is used. SSR’s normal failure mode on overloaded circuits is closed contacts (ON-STATE). 

|**SSR  Part**<br>**Number**|**Maximum**<br>**Current Capacity**|**Fuse Part**<br>**Number**|**Fuse Block**<br>**Part Number**|
|---|---|---|---|
|SSRL240AC10<br>SSRL240AC25<br>SSRL240AC50<br>SSRL240AC75<br>SSRL240AC100|10 Amps ac<br>25 Amps ac<br>50 Amps ac<br>75 Amps ac<br>100 Amps ac|KAX-10<br>KAX-25<br>KAX-50<br>KAX-70<br>KAX-100|FB-1, FB-2, FB-3<br>FB-1, FB-2, FB-3<br>BS101<br>BS101<br>BS101|
|SSRL240DC10<br>SSRL240DC25<br>SSRL240DC50<br>SSRL240DC75<br>SSRL240DC100|10 Amps ac<br>25 Amps ac<br>50 Amps ac<br>75 Amps ac<br>100 Amps ac|KAX-10<br>KAX-25<br>KAX-50<br>KAX-70<br>KAX-100|FB-1, FB-2, FB-3<br>FB-1, FB-2, FB-3<br>BS101<br>BS101<br>BS101|
|SSRL660AC50<br>SSRL660AC75<br>SSRL660AC100|50 Amps ac<br>75 Amps ac<br>100 Amps ac|KAX-50<br>KAX-70<br>KAX-100|BS101<br>BS101<br>BS101|
|SSRL660DC50<br>SSRL660DC75<br>SSRL660DC100|50 Amps ac<br>75 Amps ac<br>100 Amps ac|KAX-50<br>KAX-70<br>KAX-100|BS101<br>BS101<br>BS101|



## **LEAKAGE CURRENT** 

In the OFF state, all SSRs have a small leakage current through their contacts, typically .1mA for 240V versions and .25mA for 660V versions. As a result, a voltage potential will always exist on the LOAD SIDE, even when the “contacts” are “open”. The voltage level is a function of the load resistance. In accordance with E = IR, the voltage level equals leakage current times load resistance. 

The voltage level will rise to FULL LINE VOLTAGE under NO LOAD (open circuit) or high resistance conditions. Under normal operating conditions, however, it is very small. A 120-Watt (W) load has a resistance of 1 ohm. With “open contacts”, a leakage current of 15mA will cause 15mV across the load (E = 15 mA × 1 ohm). A mechanical switch is recommended between the AC power source and the SSR to provide electric isolation for servicing the load. 

3 

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1.35 1.35 1.35 1.3 1.3 1.35 1.35 1.35 1.3 1.3 1.35 1.3 1.3 1.35 1.3 1.3<br>Max Forward Voltage Drop<br>N/A N/A<br>660Vac 0.25  mA 0.25  mA 0.25  mA 0.25  mA 0.25  mA 0.25  mA<br>240Vac 0.1 mA 0.1 mA 0.1 mA 0.1 mA 0.1 mA 0.1 mA 0.1 mA 0.1 mA 0.1 mA 0.1 mA 0.25 mA 0.25 mA 0.25 mA 0.25 mA 0.25 mA 0.25 mA<br>(25°C max. ambient)<br>Max. Off-State Leakage<br>120Vac 0.1 mA 0.1 mA 0.1 mA 0.1 mA 0.1 mA 0.1 mA 0.1 mA 0.1 mA 0.1 mA 0.1 mA 0.25 mA 0.25 mA 0.25 mA 0.25 mA 0.25 mA 0.25 mA<br>1.6V 1.6V 1.6V 1.6V<br>Max. Contact Voltage Drop<br>ELECTRICAL SPECIFICATIONS 10 A 25 A 50 A 75 A 100 A 10 A 25 A 50 A 75 A 100 A 50 A 75 A 100 A 50 A 75 A 100 A<br>Current<br>Nominal Load<br>Voltage<br>24 to 280Vac 24 to 280Vac 48 to 660Vac 48 to 660Vac<br>Nominal ac Line<br>Output-ac Load Model No. SSRL240AC10 SSRL240AC25 SSRL240AC50 SSRL240AC75 SSRL240AC100 SSRL240DC10 SSRL240DC25 SSRL240DC50 SSRL240DC75 SSRL240DC100 SSRL660AC50 SSRL660AC75 SSRL660AC100 SSRL660DC50 SSRL660DC75 SSRL660DC100<br>**----- End of picture text -----**<br>


4 

## 

|**Input-Control Signal**|**Peak Voltage ***<br>**(60 sec. max)**|800V|800V|1200V|1200V|
|---|---|---|---|---|---|
||<br>**Max Input**<br>**Current**|10mA|14mA|10mA|14mA|
||<br>**Control Signal**<br>**Turn-Off**|10VAC|1VDC|10VAC|1VDC|
||<br>**Control Signal**<br>**Turn-On**|90VAC|3VDC|90VAC|4VDC|
||**Control Signal**<br>**Voltage**|90 to 280VAC|3 to 32VDC|90 to 280VAC|4 to 32VDC|
||**Type**|AC Control Signal|DC Control Signal|AC Control Signal|DC Control Signal|
||**Model No.**|**SSRL240AC10**<br>**SSRL240AC25**<br>**SSRL240AC50**<br>**SSRL240AC75**<br>**SSRL240AC100**|**SSRL240DC10**<br>**SSRL240DC25**<br>**SSRL240DC50**<br>**SSRL240DC75**<br>**SSRL240DC90**|**SSRL660AC50**<br>**SSRL660AC75**<br>**SSRL660AC100**|**SSRL660DC50**<br>**SSRL660DC75**<br>**SSRL660DC100**|



5 

The following SSRs are available from OMEGA Engineering. 

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Part Nominal Load<br>Number Description Current (AC Amps)<br>SSRL240AC10 AC Control Signal 10<br>SSRL240AC25 (24 to 240VAC line) 25<br>SSRL240AC50 50<br>SSRL240AC75 75<br>SSRL240AC100 100<br>SSRL240DC10 DC Control Signal 10<br>SSRL240DC25 (24 to 240VAC line) 25<br>SSRL240DC50 50<br>SSRL240DC75 75<br>SSRL240DC100 100<br>SSRL660AC50 AC Control Signal 50<br>SSRL660AC75 (48 to 660VAC line) 75<br>SSRL660AC100 100<br>SSRL660DC50 DC Control Signal 50<br>SSRL660DC75 (48 to 660VAC line) 75<br>SSRL660DC100 100<br>**----- End of picture text -----**<br>


## **MOUNTING THE SSR** 

The SSR assembly (including heat sink) can be located close to the load, minimizing the lengths of power cables. The actuating device, such as a temperature controller, can then be located in an area more convenient to the operator. 

The FHS on which the SSR is to be mounted has been pre-drilled and tapped, and is supplied with mounting screws. The SSR is supplied with a thermally conducting  pad (attached). Mount the SSR securely to the heat sink with the mounting screws. 

The best location for the SSR is an open area with unrestricted air movement. The FHS should be mounted on a vertical surface with the fins vertical. If it is mounted with the fins horizontal, or on a horizontal surface, the thermal coefficient must be re-dated by 20%. For air flow, allow at least[1] ⁄2 in. clearance at each end and 1 in. on the sides. 

6 

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2.250<br>0.275<br>1.700<br>1.750<br>1.000 1.100<br>OUTPUT<br>INPUT<br>0.450 SQ. 0.480 SQ.<br>1.850<br>0.470<br>0.870<br>0.785<br>0.250<br>**----- End of picture text -----**<br>


## **SSR Dimensions (inches)** 

Mounting Dimensions Fuse Blocks (in.) 

FB-1 3.25L x 0.75W x 1.3H FB-2 3.5L x 2.0W x 1.18H FB-1 3.5L x 3.0W x 1.3H 

BS101 1.75W x 2.29H 

supplied in 2 sections to adjust for length of fuse max. length with 100A fuse approx. 5 in. 

7 

## **SPECIFICATIONS** 

## **GENERAL SPECIFICATIONS[(1)]** 

## **PARAMETER** 

## **ALL DEVICES** 

Operating Temperature Range –20° to +80°C Storage Temperature Range –40° to +80°C Input to Output Isolation Voltage[(2)] 4000 V rms Input/Output to Ground Isolation Voltage 2500 V rms Capacitance Input to Output (Max) 8 pF Line Frequency Range 47 to 63 Hz 

## **INPUT SPECIFICATIONS[(1)]** 

|**INPUT SPECIFICATIONS(1**|||
|---|---|---|
|**AMETER**<br>Control Voltage<br>Drop Out Voltage<br>Maximum Input Current(3)<br>Turn-On Time<br>Turn-Off Time<br>Nominal Input Impedance|**SSRs**|**DC SSRs**|
||90–280 VAC<br>3–32 VDC(4)<br>10 Vrms<br>1.0 VDC<br>10 mA rms<br>14 mADC<br>20 ms<br>0.5 Cycle Max.(5)<br>30 ms<br>0.5 Cycle Max.<br>Current Regulated||



## **PARAMETER** 

## **OUTPUT SPECIFICATIONS[(1)]** 

|**OUTPUT SPECIFICATIONS(1**|**)**||||||
|---|---|---|---|---|---|---|
|**PARAMETER**|||**SSRs**|||**UNITS**|
|Maximum On-State Current(6)|10|25|50|75|100|Arms|
|Minimum On-State Current|50|50|100|100|100|mArms|
|Maximum 1-Cycle Surge(7)|150|300|750|1000|1200|Apeak|
|Maximum 1-Second Surge(8)|30|75|150|225|300|Apeak|
|On-State Voltage Drop(9)|1.35|1.35|1.3|1.3|1.3|Vpeak|
|I2T (60 Hz)|416|937|2458|5000|6000|A2sec|



## **FOOTNOTES** 

- (1) Specifications apply to TA –30 to +80°C unless otherwise noted. 

- (2) At TA of 25°C for one second, maximum leakage 1 mA. 

- (3) At maximum input voltage. 

- (4) 660V versions 4-32VDC 

- (5) Zero cross over firing. 

- (6) With relay properly mounted on an adequate heatsink. 

- (7) At TA of 25°C, non-repetitive. 

- (8) At TA of 25°C. 

- (9) At TA of 25°C and maximum on-state current. 

8 

## **WARRANTY/DISCLAIMER** 

OMEGA ENGINEERING, INC. warrants this unit to be free of defects in materials and workmanship for a period of **13 months** from date of purchase. OMEGA’s Warranty adds an additional one (1) month grace period to the normal **one (1) year product warranty** to cover handling and shipping time. This ensures that OMEGA’s customers receive maximum coverage on each product. 

If the unit malfunctions, it must be returned to the factory for evaluation. OMEGA’s Customer Service Department will issue an Authorized Return (AR) number immediately upon phone or written request. Upon examination by OMEGA, if the unit is found to be defective, it will be repaired or replaced at no charge. OMEGA’s WARRANTY does not apply to defects resulting from any action of the purchaser, including but not limited to mishandling, improper interfacing, operation outside of design limits, improper repair, or unauthorized modification. This WARRANTY is VOID if the unit shows evidence of having been tampered with or shows evidence of having been damaged as a result of excessive corrosion; or current, heat, moisture or vibration; improper specification; misapplication; misuse or other operating conditions outside of OMEGA’s control. Components which wear are not warranted, including but not limited to contact points, fuses, and triacs. 

**OMEGA is pleased to offer suggestions on the use of its various products. However, OMEGA neither assumes responsibility for any omissions or errors nor assumes liability for any damages that result from the use of its products in accordance with information provided by OMEGA, either verbal or written. OMEGA warrants only that the parts manufactured by it will be as specified and free of defects. OMEGA MAKES NO OTHER WARRANTIES OR REPRESENTATIONS OF ANY KIND WHATSOEVER, EXPRESS OR IMPLIED, EXCEPT THAT OF TITLE, AND ALL IMPLIED WARRANTIES INCLUDING ANY WARRANTY OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE ARE HEREBY DISCLAIMED. LIMITATION OF LIABILITY: The remedies of purchaser set forth herein are exclusive, and the total liability of OMEGA with respect to this order, whether based on contract, warranty, negligence, indemnification, strict liability or otherwise, shall not exceed the purchase price of the component upon which liability is based. In no event shall OMEGA be liable for consequential, incidental or special damages.** 

CONDITIONS:  Equipment sold by OMEGA is not intended to be used, nor shall it be used: (1) as a “Basic Component” under 10 CFR 21 (NRC), used in or with any nuclear installation or activity; or (2) in medical applications or used on humans. Should any Product(s) be used in or with any nuclear installation or activity, medical application, used on humans, or misused in any way, OMEGA assumes no responsibility as set forth in our basic WARRANTY/DISCLAIMER language, and, additionally, purchaser will indemnify OMEGA and hold OMEGA harmless from any liability or damage whatsoever arising out of the use of the Product(s) in such a manner. 

## **RETURN REQUESTS/INQUIRIES** 

Direct all warranty and repair requests/inquiries to the OMEGA Customer Service Department. BEFORE RETURNING ANY PRODUCT(S) TO OMEGA, PURCHASER MUST OBTAIN AN AUTHORIZED RETURN (AR) NUMBER FROM OMEGA’S CUSTOMER SERVICE DEPARTMENT (IN ORDER TO AVOID PROCESSING DELAYS). The assigned AR number should then be marked on the outside of the return package and on any correspondence. 

The purchaser is responsible for shipping charges, freight, insurance and proper packaging to prevent breakage in transit. 

FOR **WARRANTY** RETURNS, please have the following information available BEFORE contacting OMEGA: 

1. Purchase Order number under which the product was PURCHASED, 

2. Model and serial number of the product under warranty, and 

3. Repair instructions and/or specific problems relative to the product. 

## FOR **NON-WARRANTY** REPAIRS, consult 

OMEGA for current repair charges. Have the following information available BEFORE contacting OMEGA: 

1. Purchase Order number to cover the COST of the repair, 

2. Model and serial number of the product, and 

3. Repair instructions and/or specific problems relative to the product. 

OMEGA’s policy is to make running changes, not model changes, whenever an improvement is possible. This affords our customers the latest in technology and engineering. OMEGA is a registered trademark of OMEGA ENGINEERING, INC. 

© Copyright 2002 OMEGA ENGINEERING, INC. All rights reserved. This document may not be copied, photocopied, reproduced, translated, or reduced to any electronic medium or machine-readable form, in whole or in part, without the prior written consent of OMEGA ENGINEERING, INC. 

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M3813/0502