The Siemens 3VM1125-4EE46-0AA2 is a 4-pole IEC frame 160 circuit breaker with breaking capacity class S, rated Icu=36kA at 415 V. It provides line protection via a TM220 thermal-magnetic trip unit, with overload protection adjustable from Ir=18 A to 25 A and fixed short-circuit protection set at Ii=12.8 x In. The N conductor is unprotected (solid neutral), and connections are terminal type.
Breaking capacity and coordination
At 36 kA Icu @ 415 V, this breaker sits in the 'S' class of the 3VM1 range — suited for secondary distribution panels where fault levels are moderate but still require selectivity with downstream MCBs. The 160 A frame gives headroom for derating if the panel ambient runs above 40 °C; the thermal trip adjustment band (18–25 A) lets you dial in the actual load without swapping the breaker body.