Siemens 3VA1125-5EE42-0AA0-ZD00 MCCB, 55 kA @ 415 V, 25 A

Name: 3VA1125-5EE42-0AA0-ZD00
Brand: Siemens
SKU: 3VA1125-5EE42-0AA0-ZD00
Availability: LimitedAvailability
Author: Huaqiang Hank

Product details

What this MCCB carries

The Siemens 3VA1125-5EE42-0AA0-ZD00 is a 4-pole IEC frame 160 molded-case circuit breaker with a 55 kA interrupting capacity at 415 V (breaking capacity class M). It ships with a TM220 thermal-magnetic trip unit set for line protection: overload adjustable Ir=18…25 A, instantaneous fixed at Ii=12.8 x In (320 A at the 25 A rating). The neutral conductor is unprotected — this is a 3-pole + unprotected N configuration, common in delta or corner-grounded systems where the neutral does not require overcurrent protection.

Deployment context

Mounts in a standard IEC distribution board or MCC lineup on a DIN rail or screw-fixed backplate. The nut keeper kit (included) simplifies panel wiring when using box lugs. The DC Power OEM suffix flags a variant tailored for DC-side distribution in Chinese OEM builds — verify the DC voltage rating against your bus before committing the BOM line.

Frequently asked questions

What is the breaking capacity of 3VA1125-5EE42-0AA0-ZD00?

Icu = 55 kA at 415 V AC, breaking capacity class M per IEC 60947-2. This means it can safely interrupt fault currents up to 55 kA without external fuses, suitable for high-fault industrial distribution.

What does the TM220 trip unit setting mean?

TM220 is a thermal-magnetic trip. Overload (Ir) is adjustable from 18 A to 25 A via a dial on the front. Short-circuit instantaneous (Ii) is fixed at 12.8 times In — at the 25 A setting, that is 320 A. This is a line-protection curve, not motor-protection; it coordinates with downstream branch breakers.

Where can I buy the 3VA1125-5EE42-0AA0-ZD00?

This part is sourced to order against an RFQ through independent industrial distribution. Submit a request for current pricing and lead time — availability is confirmed at quote time.