What this MCCB carries and where it fits
The Siemens SENTRON 3VA2116-5HN36-0CA0 is a 3-pole molded case circuit breaker rated for 160 A continuous current at 40 °C, with an ETU350 electronic trip unit configured for line protection. Its interrupting capacity hits 187 kA at 240 V and 121 kA at 415 V — numbers that matter when you're coordinating downstream of a large transformer or feeding a high-fault panelboard. The 800 V rated insulation voltage (Ui) means it lives comfortably in 480 V and 600 V class switchgear without derating the insulation envelope. This is a DIN-rail or panel-mount frame (181 mm tall, 105 mm wide, 86 mm deep) that integrates into a standard SENTRON distribution board or standalone enclosure. The ETU350 gives you adjustable long-time, short-time, and instantaneous pickup — not a fixed thermal-magnetic curve — so you can dial in selectivity with downstream breakers without guessing. No communication module, no ground-fault monitoring, no auxiliary contacts on this variant; it's a clean line-protection block with an undervoltage release (UVR) as the only integrated auxiliary.
Thermal derating and the real continuous current
The 160 A rating holds flat from 40 °C up to 50 °C — no derating needed in a typical 40 °C panel ambient. Above that, it drops: 154 A at 55 °C, 148 A at 60 °C, 142 A at 65 °C, and 136 A at 70 °C. If your enclosure runs hot (poor ventilation, solar load, adjacent heat sources), the 55 °C or 60 °C row is the one you size against, not the 40 °C headline. The maximum power loss of 28 W at rated current gives you a number for enclosure thermal calculations.
Interrupting capacity by voltage — what the ratings mean for coordination
At 240 V the breaker clears 187 kA symmetrical — that's full-rated for most North American 240/120 V panel feeds. At 415 V and 440 V it holds 121 kA, which covers high-fault industrial grids in 400 V class systems. At 500 V it drops to 79 kA, still enough for most 480 V distribution. The steep cliff at 690 V (4.25 kA) tells you this frame is not intended for 690 V main service; at that voltage you need a different frame or a current-limiting upstream device. The 20 000 latching endurance cycles suggest it's rated for occasional switching under load, not daily motor starting — it's a distribution breaker, not a contactor replacement.