What it is and what it does
The Siemens 3VM1140-5ED42-0AA0 is a 4-pole molded case circuit breaker from the 3VM1 IEC frame 160 series, rated for line protection with a TM210 thermal-magnetic trip unit. It breaks 55 kA at 415 V (breaking capacity class M), which means it can safely interrupt fault currents up to that level without upstream damage — a key spec for panel builders coordinating selectivity in a distribution board.
Key ratings and what they mean for fit
Rated at In=40 A with overload protection Ir fixed at 40 A (not adjustable), and short-circuit protection Ii set at 10 x In (400 A). The fixed Ir means this breaker is sized for a specific 40 A load — you cannot dial it down for a smaller circuit, so confirm your continuous load matches before specifying. The 4-pole configuration with N conductor unprotected suits 3-phase + neutral systems where the neutral does not require overcurrent protection.
Sourcing and availability
This is a C-class product (manufactured/produced to order, not a stocked shelf item). Sourced and quoted to order against an RFQ through independent distribution; availability and current pricing confirmed at quote time. The active lifecycle means it remains a standard BOM line, not a last-time-buy scavenge.