Relay eliminates high surge currents

Crydom International has launched a peak switching (PS) series of AC solid-state relays.

Crydom International has launched a peak switching (PS) series of AC solid-state relays.

Significantly reducing the very high surge currents, which are normally associated with the use of transformers, the latest addition to Crydom's popular range has load-switching capabilities up to 90A at 280V AC and offers a functional and more reliable alternative to electromechanical relays.

The PS series includes an internal snubber as standard, which limits the effects of transient voltages and lower power factors.

The SSR has a 600V transient capability.

The PS series can be controlled with a wide range of DC voltage signals from 3-32V DC which makes it suitable for many control systems including 5, 12 and 24V.

Switching on a transformer at (or near) the zero cross point can result in a potentially damaging surge current.

Bruce McEachran, Technical Manager, Crydom International explains: "The chance of high surge currents being created is greatly reduced if the transformer is switched on at (or near) the peak voltage point of the supply.

We have designed a relay which reduces the often damaging effects of high inrush currents.

PS series turns on at the next peak of sinusoidal AC wave form after the input has been activated.

It continues to conduct normally until the input is de-activated and then turns off at the next current zero cross".

The relay features state-of-the-art surface mount technology to deliver proven reliability in the most demanding applications and can be offered with an input status LED.

It can be easily integrated on to Crydom's range of DIN rail mount heatsinks and offers peak load switching in an industry standard package.

The PS series carries UL approval and is manufactured at Crydom's ISO9001 certified facility for optimum product performance and reliability.

Back to top