Motor protection MCCB with 250 A continuous rating and 330 kA interrupting capacity
The Siemens 3VA2325-7MN32-0BC0 is a SENTRON molded case circuit breaker (MCCB) designed specifically for motor protection, rated 250 A continuously across the full ambient range from 40 °C to 70 °C — no derating needed up to that ceiling. Its 3-pole construction with phase failure detection and an integrated undervoltage release (UVR) makes it a direct fit for motor branch circuits where loss-of-voltage or phase-loss conditions must trip the load. Breaking capacity reaches 330 kA at 240 V, 242 kA at 415/440 V, and 187 kA at 500 V, dropping to 7.5 kA at 690 V — figures that cover most industrial distribution panels with high fault-current potential. The 250 A frame size and the motor-protection trip curve (thermal-magnetic or electronic, depending on the internal trip unit) mean this breaker coordinates with downstream contactors and overload relays in a motor control center. Dimensions are 248 mm high, 138 mm wide, 110 mm deep — a standard 3-pole MCCB footprint that fits SENTRON panelboards and distribution blocks without custom bracketing. The basic switch is built on the 3VA2325-7MN32-0AA0 base, with two HQ auxiliary switches for status feedback to a PLC or annunciator.
Sourcing and lifecycle — current production, available to order
The 250 A rating at 40 °C is the key specification for confirming fit — verify that the motor full-load current plus any continuous overload margin stays at or below 250 A. The undervoltage release (UVR) and phase failure detection are factory-integrated, so no separate add-on modules are needed for those functions.
Integration notes — panel fit and auxiliary wiring
Mounts in a standard SENTRON panelboard or on a mounting plate via the 248 mm × 138 mm footprint. The 110 mm depth leaves clearance for rear-connected bus bars or cable lugs. The two HQ auxiliary switches (form C contacts) are pre-wired to a terminal block — wire them to a PLC digital input for open/closed status, or to an alarm circuit for remote indication. The undervoltage release (UVR) coil is powered from the line side; if the control voltage drops below its dropout threshold, the breaker trips. This is typical for emergency-stop circuits or undervoltage protection schemes. Phase failure detection is internal — no external phase-loss relay needed. Maximum power loss is 40 W at full rated current — account for this heat in enclosed panel thermal calculations. Operating temperature range is -25 °C to 70 °C; storage range is -40 °C to 80 °C.