The role of solar container relay

What does a relay do?

Relays use voltage, current, and frequency set points to initiate an action, and can perform a wide range of functions — from grid isolation to load shedding to turning on a backup generator.

What is a Zettler azsr235/250 PCB solar relay?

PCB relays.ZETTLER Europe was one of the first companies to have successfully developed and produced a 35 A and 50 A PCB solar relay (AZSR235/250) with a footprint of just 25mm x 40mm and the capability of handling 2 x 35A (50 A) at a holding power of < 100 mW (see below under

How does a static relay work?

The static relay receives an input signal, processes it, and decides whether to open or close the circuit. No moving parts are required. Most utilities prefer static relays because they are generally faster to operate, longer-lasting, and more precise than electromechanical relays.

Do generators need a normally closed relay contactor?

For example, utilities may require a normally open relay contactor for grid isolation, so the system is isolated by default, even if the relay and isolation contactor or breaker fails. On the other hand, devices with emergency stop buttons—commonly found on diesel generators—will typically use a normally closed relay contactor.

What is a protective relay?

Protective relays monitor voltage, current, or frequency and respond to abnormal conditions by opening or closing a switch to isolate parts of a circuit. Based on their switching mechanism, relays can be divided into two categories: electromechanical and static. Electromechanical protective relays use moving parts to open and close switches.

What happens when a relay is energized or triggered?

When energized (electromechanical) or triggered (static), the relay closes the switch to allow current flow. Normally closed relays are the opposite. When energized (electromechanical) or triggered (static), they open, preventing current flow. Relay switches are shown above in their default “de-energized” position.