Siemens 3VA1112-3EF36-0JH0 — 125 A SENTRON MCCB for Line Protection
The Siemens 3VA1112-3EF36-0JH0 is a SENTRON molded case circuit breaker (MCCB) rated for 125 A continuous current at 40 °C, 3-pole, configured for line protection. It carries a TM240 thermal-magnetic overcurrent release and an integrated shunt trip (STL) for remote tripping. The interrupting ratings climb to 75.6 kA at 240 V and 52.5 kA at 415 V — enough headroom for most distribution panels feeding motor control centers or lighting circuits. The 125 A rating holds flat from 40 °C through 50 °C, then derates to 120 A at 55 °C and 112.5 A at 70 °C. That means in a warm enclosure — say a non-ventilated panel near a furnace line — you size the load at 112.5 A, not the nameplate 125 A. The 800 V rated insulation voltage (Ui) covers 480 V and 600 V class systems with margin. This MCCB mounts on a DIN rail or panel base inside an IP40-front enclosure. The auxiliary contact block ships as 2 auxiliary switches plus 1 trip alarm switch (HQ configuration) — that gives you a separate signal for the breaker tripped state, useful for PLC alarming or a remote annunciator.
Interrupting Capacity and Selectivity
The interrupting ratings step down as system voltage rises: 75.6 kA at 240 V, 52.5 kA at 415 V, 32 kA at 440 V, and 10.5 kA at 690 V. That 10.5 kA figure at 690 V is the limiting case — if your panel feeds a 690 V drive bus, verify the available fault current stays under that number. The 52.5 kA at 415 V is the typical European distribution level; it coordinates well downstream of a 65 kA-rated main breaker.
Auxiliary and Trip Configuration
The shunt trip (STL) is factory-integrated — no field kit to install. The auxiliary contact version is 2 auxiliary switches + 1 trip alarm switch HQ, wired via the front terminals. The integrated auxiliary trip order code is 3VA9688-0BL32 if you need a spare or replacement module. No undervoltage release, no communication function, no phase failure detection — this is a basic line-protection breaker, not a smart metering device.
Environmental and Mechanical
Operating temperature range is -25 °C to 70 °C; storage range is -40 °C to 80 °C. The latching endurance is rated at 15 000 cycles — that's the mechanical life for the switching mechanism. Dimensions are 130 mm height, 76.2 mm width, 70 mm depth, fitting standard 3-pole MCCB panel cutouts.