63 A MCCB with full thermal-magnetic hold across the panel ambient range
The Siemens 3VA2163-5JQ32-0HH0 is a SENTRON molded case circuit breaker rated for line protection, carrying a continuous 63 A from 40 °C all the way up to 70 °C — no derating needed in a warm enclosure. That flat thermal curve means the breaker holds its 63 A full-scale value regardless of where it sits in the panel stack, so you don't have to oversize for ambient. Three poles, shunt trip (STL) fitted, plus two auxiliary switches and a trip alarm switch HQ. The interrupting ratings climb to 187 kA at 240 V and 121 kA at 415 V, which gives selectivity headroom for a main or feeder position downstream of a larger upstream device.
Interrupting capacity and selectivity coordination
At 415 V the breaker clears 121 kA; at 500 V it still handles 75.6 kA. The 690 V rating drops to 3.7 kA — that's the limit for a 690 V line-side fault, so if your system runs at 690 V, verify the available fault current stays under that figure. The 187 kA at 240 V is typical for a 63 A frame sized to backstop a transformer secondary or a large distribution board. The minimum rated current is 95 A, which means the breaker's magnetic trip threshold starts at that level — the 63 A continuous rating is the thermal pickup, not the instantaneous magnetic floor.
Panel fit and auxiliary wiring
Footprint: 105 mm wide, 181 mm tall, 86 mm deep — fits a standard 3-pole MCCB cutout. The shunt trip (STL) allows remote tripping from a safety circuit or E-stop relay; wire it per the terminal diagram on the breaker side. Two auxiliary switches plus a separate trip alarm switch HQ give three independent signal paths — one for the PLC status input, one for a panel lamp, one for the alarm annunciator. Communication function is present, so the breaker can report status over the bus if the system uses the 3VA2 communication module.