S8-1204-HR

## **| S8 FORM A SERIES** 

## MINIATURE HIGH VOLTAGE RELAY, 4KV ISOLATION 

The S8, S8 (UL), S8-HR Form A series are miniature high voltage reed relay for applications where space saving is a prime consideration. 

The coil pins are positioned near the center of the relay while the contact pins are near the ends to give improved isolation between the High Voltage contacts and the low voltage coil. 

## Features 

- Space saving package 

- Up to 1000V switching voltage 

- Isolation Voltage across contacts 4kV & 5kV (dependent on coil voltage) 

- Isolation Voltage 7kV contact to coil 

- 2.5A carry current 

- S8 (UL) & S8-HR series UL approved 

## Applications 

- Medical 

- Automated test equipment 

- Test and measurement 

## **SPECIFICATIONS** 

|**Contact**||**Condition**|**5V coil**|**12V coil**|**24V coil**|
|---|---|---|---|---|---|
|**Switch Action**|||SPST (Form A)|||
|**Material**|||Rhodium|||
|**Isolation Across Contacts**|kV|DC or AC peak|4|4|5|
|**Switching Power Max.**|VA|(W for V variants)|100|||
|**Switching Voltage Max.**|V||350dc/300ac (1000Vdc & ac peak for V variants)|||
|**Switching Current Max.**|A|DC or AC peak|1.0|||
|**Carry Current Max**|A|DC|2.5|||
|**Capacitance Across Contacts**|pF|coil to screen<br>grounded|0.5 (typical)|||
|**Lifetime Operations**||dry switching|109|||
|||100W switching|107|||
|**Contact Resistance**|mΩ max||150|||



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Coil Condition 5V coil 12V coil 24V coil<br>Must Operate Voltage V DC 4 9.6 19<br>Must Release Voltage V DC 1 2 3<br>Operate Time ms diode fitted 1 1 1<br>Release Time ms diode fitted 0.5 0.5 0.5<br>Resistance Ω 120 750 1550<br>Relay<br>Isolation Contact/Coil kV 7<br>Ω, Between all isolated<br>Insulation resistance S8,(U),(V), 10 [10]  (10 [12] )<br>pins at 1000V, 20°C<br>min. (typical) S8(-HR), 10 [12]  (10 [14] )<br>±5°C, 45% RH ±10%<br>Environmental Conditions<br>Operating Temp Range ºC -40 to +85*<br>Storage Temp Range ºC -40 to +125<br>**----- End of picture text -----**<br>


Note. The operate / release voltage and coil resistance will change at a rate of 0.4% per °C. Values are stated at room temperature (20 °C) *UL approved for use at up to 75°C 

## **STANDARD PARTS** 

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Isolation Across  Max. Switching Voltage Vdc<br>S8 Series S8-HR Series S8 (UL) Series Coil Voltage Vdc<br>Contacts kV (Vac peak)<br>S8-0504 S8-0504-HR S8-0504U 5 4 350 (300)<br>S8-0504V S8-0504V-HR S8-0504VU 5 4 1000 (1000)<br>S8-1204 S8-1204-HR S8-1204U 12 4 350 (300)<br>S8-1204V S8-1204V-HR S8-1204VU 12 4 1000 (1000)<br>S8-2405 S8-2405-HR S8-2405U 24 5 350 (300)<br>S8-2405V S8-2405V-HR S8-2405VU 24 5 1000 (1000)<br>**----- End of picture text -----**<br>


Custom versions can be designed for particular applications. Please contact Sensata with your requirements. 

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## **DIMENSIONS** 

All dimensions are in millimeters. Tolerances acc. to ISO 2768 class m 

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Cynergy3<br>S8XXXXXXX ‘U’ suffix adds UL mark<br>RoHS<br>XXXX<br>350.00 +0.5 | 7 +0.5<br>**----- End of picture text -----**<br>


Pins 0.635mm Square ±0.05mm. Pins 1 & 2 Tin over Nickel plated, on CuSn6 Phospher Bronze. Pins 3 & 4 Tin plated on NiFe Nickel Iron. Case Material Nylon. Encapsulant: Epoxy 

## ***Consult factory for UL ratings** 

These products have been UL approved for use as per pollution degree 2 classification. If you require further information as to how this may affect product usage, please contact https://www.sensata.com/contact-us. 

## **Please refer to this document for circuit design notes:** 

https://www.cynergy3.com/blog/reed-relay-application-notes 

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