Siemens SENTRON 3VA1125-6ED46-0AA0 — 25 A, 4-Pole MCCB with TM210 Release
The Siemens 3VA1125-6ED46-0AA0 is a SENTRON molded case circuit breaker (MCCB) rated for 25 A continuous current (Iu) with a 4-pole configuration. It uses a TM210 thermal-magnetic overcurrent release, meaning the thermal element handles overloads and the magnetic element handles short-circuits — no electronic adjustment beyond the magnetic pickup. Breaking capacity is the headline here: 220 kA at 240 V AC, 154 kA at 415 V, 121 kA at 440 V, and still 17 kA at 500 V and 690 V. That 220 kA figure at 240 V is exceptionally high — this breaker is designed for high-fault-current installations, typically downstream of large transformers or in industrial mains where available fault current exceeds standard 65 kA or 100 kA ratings. The adjustable short-circuit release (Ii) can be set up to 320 A, giving flexibility to coordinate with downstream devices. The rated insulation voltage (Ui) is 800 V, and the maximum DC operational voltage is 600 V — so it can also serve in DC circuits like battery banks or DC bus distribution.
Thermal Derating and Panel Integration
Current rating is 25 A at 45 °C and 50 °C, derating to 24 A at 55 °C and 60 °C, then 23 A at 65 °C and 70 °C. That 2 A drop across the full temperature range is modest — the breaker holds its rating well in warm enclosures. Mounted on a DIN rail or panel, the 70 mm depth and 101.6 mm width fit standard MCCB footprints. IP40 on the front means protection against tools and wires >1 mm — standard for panel-mounted breakers. No internal communication function, no ground-fault monitoring built in; those are separate accessory modules. The motor drive option (Product Extension Optional) allows remote motorized operation for automated disconnection. Power loss is 8.5 W maximum at rated current — useful for thermal budget calculations in a sealed enclosure. Storage temperature range is -40 °C to 80 °C; operating range is -25 °C to 70 °C.
Selectivity and Coordination Notes
For selectivity studies: the 220 kA at 240 V and 154 kA at 415 V mean this breaker can be the main or feeder device in high-fault panels. The TM210 release is fixed thermal (25 A) with adjustable magnetic (Ii up to 320 A) — coordinate the magnetic pickup with downstream breakers to avoid nuisance tripping on motor inrush or capacitor charging currents. The 4-pole design covers three-phase plus neutral protection (or switched neutral). The N-conductor protection design is listed as 'Without', meaning the neutral pole is switched but not protected — typical for TN systems where neutral overcurrent is not expected.