Solid state relay integrates current limiting and thermal shutdown

Integrating both current limiting and thermal shutdown, the CPC1561B solid state relay can be used for smart homes, building automation, instrumentation and battery power applications, says Littelfuse.

The CPC1561B enhances electronics capabilities to survive fault conditions through active current limiting.  At 1A, 60V, the fault-protected solid state relay is claimed to be the highest current, normally-open SSR currently available to integrate both current limiting and thermal shutdown circuits.

For active current control, the circuitry senses load current and regulates MOSFET gate drives to survive over-current conditions. For thermal shutdown, the circuitry senses die temperature and works in conjunction with current limit control to protect the device.

The solid state relay adapts to fault conditions using thermal shutdown fault mode protection at 128 degrees C die temperature. It also offers input-output galvanic isolation via 3750V RMS input-to-output isolation.

The small, surface-mount CPC1561B solid state relay has dual fault protection, making it a rugged device for demanding applications that is not possible when using electro-mechanical relays and standard solid state relays, says Littelfuse.

In addition to smart homes and building automation systems, it can also be used in gaming and instrumentation designs and for battery powered systems that cannot afford to be out of operation for long periods of time, due to over-current, over-temperature and electrical stress.

According to Steve Andrezyk, director of marketing for Littelfuse-IXYS Integrated Circuits, “The CPC1561B output relay can survive harsh conditions and resume normal operation once the fault is removed, thus reducing product down time and potentially eliminating service call time as the solid state relay both protects itself and resets to resume normal operation.”

Equipment downtime and the cost of repair are minimised through the CPC1561B’s recovery with auto-reset capabilities, which avoids system failures.

The CPC1561B is available now in tape and reel format. Sample requests can be placed through authorised Littelfuse distributors worldwide.

Littelfuse manufactures circuit protection, power control, and sensing devices. Its products are used in automotive and commercial vehicles, industrial applications, data and telecommunications, medical devices, consumer electronics and appliances.

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