SSRs: Low noise, reliable switching
Our solid state relays (SSRs) are engineered for ultra-reliable switching of AC or DC loads, featuring inherently low switching noise and extremely long life. SSRs use the electrical and optical properties of semiconductors to perform switching functions and output isolation, and have no moving parts that can wear out and no contact bounce issues. SSRs have voltage turn-on and zero current turn-off that eliminates electrical noise and transience. SSRs are used in devices that need quick switching times and require a high number of life cycles. They are often used in electrical devices because of their SWaP (size, weight, and power) characteristics versus electro-mechanical devices.
Specifications for Solid State Relays
- AC SSRs are qualified to MIL-PRF-28750/9 for 2A rated JDS9 series, and /10 for 25A rated JPS10 series, and to DSCC drawing 86031 for the 10 A PS12 series.
- DC SSRs are qualified to loads from low level to 2 Amps/60V.
- Some TE DC SSR relays are available with optional status monitoring and/or short circuit protection.
- 10 and 25A rated AC SST mounting configurations are designed primarily for panel or chassis mounting.
- The 2A rated AC JDS9 series and all DC models are designed for printed circuit board mounting, with some models configured for surface mount connection.
- Most models are approved to the applicable military specification, MIL-PRF 28770, or associated detail drawings.
- Special application specific models can be made available.
Frequently Asked Questions
Solid State Relays (SSRs)
Q: What is a solid state relay (SSR)?
A: An SSR is a relay with no moving contacts, and employs semiconductor switching elements like triacs, thyristors, and diodes. Input and output sides are isolated using photocouplers.
Q: How are SSRs different from electromechanical relays?
A: Both perform the same switching function, but their constructions are different. SSRs do not have any moving parts such as an armature or metal contacts, making them free of noise and arcs.
Q: Are SSRs expensive compared to electromechanical relays?
A: Initial cost of purchase is high for SSRs. But due to their long life capactiy and ability to handle heavy loads, SSR cost works out economically in the long run.