FAQ No. FAQ03219
What does "inverse-time operation" refer to in a Motor Relay?
This refers to a limiting motion caused by an overload factor. When a
large current flows, the time until operation is shortened, and when a
small current flows, the time until operation is lengthened.
The following figure shows inverse-time operation characteristics for the
K2CM Motor Protective Relay.
The motor itself will not burn immediately when an overcurrent is applied
to it, and is generally able to withstand an overload that lasts
approximately as long as the start-up time.
Inverse-time operation characteristics make it possible to prevent
unnecessary operation stops by using the inrush current at start-up to
trip the motor or stopping the motor when an overload condition extends
for a short time.
Other Measuring & Monitoring Relay
Can the AGF or K2GS be combined with another company's ZCT (zero-phase current transformer) or ZPD (zero-phase voltage detector)?
Can the parameters of the K2CA be changed during actual use?
What devices can be used in combination with the K2GS-B?