The Siemens SENTRON 3VA1125-5EF32-0BA0 is a 3-pole molded case circuit breaker (MCCB) rated for 25 A continuous current, built around the TM240 thermal-magnetic overcurrent release. It carries a rated insulation voltage of 800 V and delivers interrupting capacity that scales with system voltage: 187 kA at 240 V, 121 kA at 415 V, 75.6 kA at 440 V, and 17 kA at 690 V. That spread means it can serve as a main or branch breaker in high-fault panels where the available short-circuit current is known to be substantial at lower voltages.
Thermal derating and ambient limits
The 25 A rating holds flat from 40 °C through 50 °C. Above that, the breaker derates gradually: 24 A at 55 °C, 23.5 A at 60 °C, 23 A at 65 °C, and 22.5 A at 70 °C. If the panel ambient runs above 50 °C — common in sealed enclosures or near heat sources — the actual continuous current the breaker can carry without nuisance tripping is the derated figure, not the nameplate 25 A. Operating ambient range is -25 °C to 70 °C; storage range is -40 °C to 80 °C.
Undervoltage release and auxiliary options
This version ships with an integrated undervoltage release (UVR) — the auxiliary release type is designated as undervoltage release. It does not include auxiliary contacts or a voltage trigger. The integrated auxiliary trip is specified as order code 3VA9608-0BB11, which is the companion shunt trip or UVR module that mates to the breaker. No communication function, phase failure detection, or ground fault monitoring is built in; those are separate variants in the 3VA family.
Mechanical endurance and physical fit
Rated for 15,000 latching operations. The breaker measures 130 mm high, 76.2 mm wide (3-inch standard), and 70 mm deep. Front protection is IP40 — suitable for enclosed panel mounting where the front face is behind a door. The DIN EN 81346-2 reference code is Q, consistent with switchgear function. Panel builders should account for the 70 mm depth when routing busbars or cables behind the breaker.
Sourcing and lifecycle
The lifecycle stage is marked as current production. This is an active, in-production Siemens SENTRON 3VA line-protection MCCB. Sourced to order against an RFQ through independent distribution; availability and current pricing confirmed at quote time.