What this 3VA1 frame breaker delivers
The Siemens 3VA1163-6MH36-0CH0 is a 3-pole IEC frame 160 circuit breaker rated at 63 A continuous, with a high breaking capacity of 70 kA at 415 V AC (class H). That Icu number means it can safely interrupt a 70 kA fault without self-destructing — critical for high-fault installations like transformer secondaries or large motor control centers where upstream coordination demands a stiff breaker. This variant is configured for starter protection with a TM120M thermal-magnetic release, but note the spec: it provides short-circuit protection only (Ii adjustable 5–15× In), without overload protection. That means it's intended for use ahead of a separate motor starter or contactor that handles the overload function — not as a standalone motor-protective breaker. The undervoltage release (UVR) coil is rated 120–127 V AC, 50/60 Hz, and will trip the breaker on voltage loss or dip. It ships with two HQ auxiliary switches and one HQ trip alarm switch, plus clamp-type terminals for wiring. The HQ designation indicates high-rupturing-capacity microswitches rated for control-circuit isolation. Mounts on standard DIN rail or panel — typical for IEC distribution boards and machine control cabinets.