Siemens SENTRON 3VA1120-6ED36-0AA0 — 20 A MCCB for Line Protection
The Siemens 3VA1120-6ED36-0AA0 is a SENTRON-series molded case circuit breaker (MCCB) rated for 20 A continuous current at 40 °C, with a TM210 thermal-magnetic overcurrent release and three poles for three-phase line protection. Its 220 kA interrupting capacity at 240 V AC means it can safely clear a bolted fault on a high-capacity transformer secondary without the arc flashing over to adjacent gear — a critical parameter for panel builders sizing the SCCR of a distribution board.
Ratings and What They Mean for Your Panel
Rated current holds at 20 A from 40 °C through 55 °C ambient, derating only to 19 A at 60–70 °C — so in a warm enclosure the breaker still carries its full nameplate load up to 55 °C. The TM210 release is a fixed thermal-magnetic type, meaning no interchangeable trip units; the breaker itself is the calibrated element. Breaking capacity drops from 220 kA at 240 V to 154 kA at 415 V, then 121 kA at 440 V, and 17 kA at 500 V and 690 V — the steep drop above 480 V means this is primarily a 240 V / 480 V class device; for 690 V applications the available fault current must be verified against the 17 kA rating.
Physical Fit and Panel Integration
The breaker measures 76.2 mm wide (3 in), 130 mm tall (5.12 in), and 70 mm deep (2.76 in) — a standard 3-pole MCCB footprint that fits most DIN-rail or panel-mount enclosures with the appropriate SENTRON mounting accessories. Front IP40 protection means it is suitable for general-purpose indoor panels but not washdown areas. No undervoltage release or shunt trip is fitted as standard; those are add-on accessories if the safety circuit requires a remote trip.
Approvals and Compliance Documentation
As a Siemens SENTRON product, this MCCB carries CE marking for the European market and is designed to meet IEC 60947-2. UL and CSA listings are typical for the 3VA family, though specific certification details should be confirmed from the nameplate or factory certificate. RoHS and REACH compliance documentation is available from Siemens per standard industrial practice.