AM3 series
Main technical Specifications
Type Rated Cureent(A) Pole number Rated 
Insultating Voltage(V)
Rated 
Opreating Voltage(V)
Ultimate Short circuit breaking capacity(KA) Servies short circuit breaking capacity(KA) Operation 
performance
(endurance)
Operation performance
AC380V
(400)
AC660V
(690)
DC250 AC380V
(400)
AC660V
(690)
Load Unload L W(3P/4P) H
AM3-125E 12.5,16,20,
25,32,40,50,
63,80,100,125
Two 
three
four
pole
660V ≯30 15 - - 7.5 - 3000 7000 120 76/101 70
AM3-125S 25 - 20 16 -
AM3-160S 16,20,32,
40,50,63,80,
100,125,160
380V
660V
35 8 20 18 - 4000 6000 120 90/120 70
AM3-160H 50 10 40 25 -
AM3-250S 100,125,
160,180,200,
225,250
35 10 40 18 - 2000 6000 170 105/140 103.5
AM3-250M 50 16 40 30 -
AM3-250H 200,225,250
315,350,400
65 18 40 48 - 1000 4000 254 140/184 103.5
AM3-400S 35 16 40 18 -
AM3-400M 50 20 40 20 -
AM3-400H 65 25 40 48 -
AM3-630S 400,500,630 50 20 40 30 - 1000 4000 268 210/280 103.5
AM3-630M 65 25 40 48 -
AM3-630H 80 30 40 60 -
AM3-800S 500,630
700,800
50 20 40 30 - 1000 4000 268 210/280 103.5
AM3-800M 65 25 40 48 -
AM3-800H 80 30 40 60 -


Motion characteristic

The thermodynamic release of a circuit breaker provides the feature of inverse time-delay, while the magnetic release is the instantaneous operation as shown on table 2(distribution circuit breaker) and table 3 (motor protection circuit breakers).
Table 2
Rated current of release(A)

Thermodynamic Release
(ambient templand +40℃ marine +45℃)

Operational current of 
magnetic release(A)
1.05In(cold state)
inoperative time(h)
1.30In(heat state)
operative time(h)
10≤In≤63 ≥1 < 1 10-50In±20%
63<In≤250 ≥2 < 2 10In±20%
5-10In±20%
250<In≤800 ≥2 < 2
 
Table 3
Rated current of release(A)

Thermodynamic Release
(ambient templand +40℃ marine +45℃)

Operational current of 
magnetic release(A)
1.0In(cold state)
inoperative time(h)
1.20In(heat state)
operative time(h)
1.50In(heat state)
operative time(h)
7.2In(cold state)
operative time(h)
12.5≤In≤400 2 2 4min 2s<Tp≤10s 12In±20%