What this 3VA1150-3EF36-0AH0 carries and where it fits
Siemens 3VA1150-3EF36-0AH0 is a SENTRON MCCB with TM240 release, rated 50 A at 40 °C through 50 °C, derating to 45 A at 70 °C. Interrupting capacity is 75.6 kA at 240 V, dropping to 52.5 kA at 415 V, 32 kA at 440 V, and 11.9 kA at 500 V and 690 V. That 75.6 kA at 240 V is the headline number for North American 240/120 V split-phase or 240 V delta services; at European 400 V class, you still have 52.5 kA, which clears most industrial fault levels below large transformer secondaries. The 11.9 kA at 690 V is the floor — still adequate for most 690 V motor control centers unless the upstream transformer is oversized. Three-pole construction, 800 V rated insulation voltage, and maximum power loss of 14.6 W. The auxiliary switch configuration is 2 auxiliary switches plus 1 trip alarm switch HQ — that means it carries two NO/NC auxiliary contacts for status feedback and a dedicated alarm contact that changes state only on a trip event, not on manual open. Useful for remote trip indication without stealing an auxiliary contact.
Mounting dimensions and panel fit
Width 76.2 mm (3 in), height 130 mm (5.12 in), depth 70 mm (2.76 in). Operating temperature range is -25 °C to +70 °C; storage range is -40 °C to +80 °C. The storage limits are wider because the breaker is not carrying current or under mechanical stress — the -40 °C floor matters if the panel is shipped or stored in an unheated warehouse in a cold climate.