The Siemens 3VA1150-3EE42-0AA0-ZD00 is a 4-pole IEC frame 160 molded case circuit breaker with a 50 A rated current (In) and a 25 kA ultimate breaking capacity (Icu) at 415 V, class N. It carries a thermal-magnetic TM220 trip unit with adjustable overload protection (Ir) from 35 A to 50 A and fixed short-circuit protection set at 10 times In. The N conductor is unprotected, and the breaker includes a nut keeper kit; this variant is configured for DC Power OEM supply in China.
The adjustable thermal overload (Ir = 35–50 A) lets you match the breaker to the actual continuous load, while the fixed magnetic trip at 10× In (500 A) clears hard shorts fast. The unprotected N conductor means this is a 3-pole protected + solid neutral configuration; verify the system grounding scheme before specifying.
Deployment context
The nut keeper kit simplifies busbar or cable lug termination in high-vibration environments. The DC Power OEM designation flags that this variant is configured for DC-side protection in power supply or battery applications — confirm polarity and DC voltage rating before installation.