The Siemens SENTRON 3VA2125-5MN36-0AA0 is a 3-pole molded case circuit breaker (MCCB) rated for 25 A continuous current, flat across the entire -25 °C to 70 °C operating range — no derating needed as the panel warms up. Its interrupting capacity hits 187 kA at 240 V AC, dropping to 121 kA at 415 V and 440 V, then 75.6 kA at 500 V, and 3.7 kA at 690 V. That 187 kA figure at 240 V means it can clear a fault at the full prospective short-circuit current of a large 240 V distribution transformer without the arc flashing over or the case rupturing — a critical spec for high-fault panels in industrial switchgear.
Motor protection with adjustable trip class
This MCCB is designated for motor protection duty and carries the ETU350M electronic overcurrent release. The trip class is field-adjustable among 10A, 10E, and 20E — so you can match the thermal memory to the motor's starting profile: 10A for short acceleration times (standard pumps, fans), 10E for slightly longer starts, and 20E for high-inertia loads like centrifuges or crushers that take several seconds to reach speed. Phase failure detection is built in, which prevents single-phasing damage on a three-phase motor.
Panel fit and integration
Dimensions are 105 mm wide, 181 mm high, and 86 mm deep — a standard 3-pole MCCB footprint that drops into most Siemens 3VA panelboards and switchgear cubicles without busbar rework. The front face carries an IP40 protection class, adequate for enclosed panel mounting where no water ingress is expected. Rated insulation voltage is 800 V, so it can be used in 690 V systems with full clearance margins.
Selectivity and coordination
The ETU350M electronic release allows fine-tuned I²t curves for selective coordination with downstream breakers. The flat 25 A rating across the full temperature range means no nuisance tripping in hot enclosures. Power loss is only 0.6 W maximum — negligible for panel thermal budgeting.