Moeller - Motor protection

Pick-up times [t-head1-pg]

Response limits of time-delayed overload relays at all-pole load.


Type of overload relay	Multiple of current setting						Reference ambient temperature
	A t > 2 h starting from cold state of relay	B t ≤ 2 h	C Tripping class 10 A 10 20 30	Tripping time in minutes ≤ 2 ≤ 4 ≤ 8 ≤ 12	D Tripping class 10 A 10 20 30	Tripping time in seconds 2 < T ≤ 10 4 < T ≤ 10 6 < T ≤ 20 9 < T ≤ 30
Non-ambient temperature compensated thermal relays and magnetic relays	1.0	1.2	1.5		7.2		+ 40 ˚C
Ambient temperature compensated relay	1.05	1.2	1.5		7.2		+ 20 ˚C

In the case of thermal overload relays with a current setting range, the response limits must apply equally to the highest and the lowest setting of the associated current.

Response limits of 3-pole thermal overload relays at 2-pole load


Type of thermal overload relay	Multiple of current setting				Reference ambient temperature
	A t > 2 h, starting from cold state of relay		B t ≤ 2 h
Ambient temperature compensated, without phase-failure sensitivity	3 poles	1.0	2 poles 1 pole	1.32 0	+ 20 ˚C
Non-ambient temperature compensated, without phase-failure sensitivity	3 poles	1.0	2 poles 1 pole	1.25 0	+ 40 ˚C
Ambient temperature compensated, with phase-failure sensitivity	2 poles 1 pole	1.0 0.9	2 poles 1 pole	1.15 0	+ 20 ˚C

In the case of thermal overload relays with a current setting range, the response limits must apply equally to the highest and the lowest setting of the associated current.