Protection relays have different functions. They are often made up of several modules, each of which performs a specific function. In this guide, we will distinguish three types of functions: protection against abnormal variations in the main supply, protection against leakage currents, and protection against overloads.
Protection against abnormal grid variations
Abnormal voltage, current, and frequency variations can lead to problematic phenomena....
three-phase motor pump protection relay
SubMonitor
... pumps with horsepower ratings between 3 and 200 hp. Current, voltage and motor temperature are monitored using three integrated current transformers. A digital display provides current and voltage readings ...
safety protection relay
Tripping current: 4, 6 A
Trigger voltage: 24 V
... 13/14,23/24:The terminal of dual safety output (NO) 31/32: The terminal of signal output (NC) Power:Red LED, power (V+/V-)on CH1:Green LED,light on when safety relay K1 closed CH2:Green ...
voltage protection relay
ARKENS PR
Multipurpose digital protection relay - IEC 61850 - Station Bus This cost-effective protective device is used to perform advanced protection, control and monitoring ...
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