What the ratings mean for fit
The 3VA1112-6MH32-0CH0 is a 3-pole IEC molded case circuit breaker on the 3VA1 frame, rated 125 A continuous with a breaking capacity of 70 kA at 415 V AC (class H). That 70 kA Icu means it can safely interrupt a fault current up to that level without welding contacts or rupturing — critical for high-fault locations like main switchboards or large motor control centers where the available short-circuit current is substantial. This variant is configured for starter protection: the TM120M thermal-magnetic trip unit is set for motor starting inrush, with an adjustable magnetic short-circuit pickup Ii = 5...15 x In (625 A to 1875 A). Note it ships without overload protection — the description explicitly states 'without overload protection' — so the motor's thermal overload relay must be provided separately in the starter circuit. The integrated undervoltage release (UVR) operates on 120-127 V AC, 50/60 Hz. If the control voltage drops, the UVR trips the breaker open — standard for emergency-stop or undervoltage protection schemes. Two auxiliary switches (HQ) plus one trip alarm switch (HQ) give status feedback for PLC or indication lights. The nut keeper kit is included, which secures the terminal nuts against vibration — useful on mobile or high-vibration installations.
Lifecycle and sourcing reality
This part can be sourced to order against an RFQ. Availability and pricing are confirmed at quote time.
Deployment context
This breaker mounts in a standard panel or enclosure on a DIN rail or directly on a mounting plate — the 3VA1 frame is designed for both. The 125 A rating and 70 kA breaking capacity suit it for motor branch circuits, feeder protection, or as a main disconnect in smaller distribution boards where high fault current is expected.