Siemens 3VA1140-4EF36-0JA0 — 40 A MCCB for Line Protection
The Siemens 3VA1140-4EF36-0JA0 is a 3-pole molded case circuit breaker from the SENTRON 3VA series, rated for a continuous current Iu of 40 A and an insulation voltage Ui of 800 V. It is configured for line protection with a TM240 thermal-magnetic overcurrent release and includes an integrated shunt trip (STL) for remote tripping. The interrupting ratings are 121 kA at 240 V, 75.6 kA at 415 V, 52.5 kA at 440 V, and 11.9 kA at 690 V, covering most industrial distribution fault levels. The 40 A rating holds flat from 40 °C through 50 °C, then derates linearly to 36 A at 70 °C — a clean thermal curve that avoids surprises in a warm enclosure. The 70 mm depth and 76.2 mm width fit the standard SENTRON 3VA panel footprint, so a swap from a same-frame 3VA breaker requires no bus-bar rework.
Panel Fit & Integration
The 3VA1140-4EF36-0JA0 mounts on a DIN rail or panel-mount base. The 76.2 mm width (4 module spaces on a 18 mm pitch) and 130 mm height leave clearance for adjacent breakers and bus-bar connections. The IP40 front protection suits enclosed distribution boards; no additional gland-plate sealing is needed for dry indoor locations.
Key Ratings & What They Mean
The TM240 release combines a thermal bimetal for overload protection and a magnetic coil for short-circuit protection. The 121 kA at 240 V rating means this breaker can safely interrupt a fault current up to that level without welding contacts or rupturing the case — critical for high-fault-capacity panels near large transformers. The shunt trip (STL) allows remote tripping from a PLC or emergency-stop circuit, using an auxiliary release order code 3VA9688-0BL32. Mechanical endurance is rated at 15,000 operations, covering frequent switching in machine-tool or process-line applications. No auxiliary contacts, undervoltage release, or communication function are fitted on this variant — those are separate add-on modules if needed.