Braking Capacity
Definition: The maximum current a circuit breaker can safely interrupt under normal operating conditions without damage.
Making Capacity
Definition: The maximum current a circuit breaker can safely close onto (or make) without damage, especially when closing onto a short-circuit.
Short-Time Capacity
Definition: The maximum current a breaker can carry for a short time (e.g., a few seconds) without tripping or damage.
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Rated secondary current of C.T. = 5 A
Pickup current = 5 1.25 = 6.25 A
Fault current in relay coil = 50A
∴ Plug-setting multiplier (P.S.M.)
Corresponding to the plug-setting multiplier of 8
(See Fig.), the time of operation is 3.5 seconds.
∴ Actual relay operating time
= 3.5 Time-setting
= 3.5 0.6
= 2.1 seconds
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