The Siemens SENTRON 3VA2040-6JQ36-0AA0 is a 3-pole molded case circuit breaker rated for 40 A continuous current at 40 °C through 70 °C, with no derating across that span. It's built for line protection and includes a communication function for integration into monitored panels. The insulation voltage is rated at 800 V.
Breaking capacity across voltages
Breaking capacity is 242 kA at 240 V, 187 kA at 415 V and 440 V, 121 kA at 500 V, and 3 kA at 690 V. At 690 V the rating drops sharply — this breaker is optimized for standard low-voltage distribution (240–500 V) where fault currents are high. The 242 kA at 240 V is the headline figure, enough for high-capacity transformer secondaries or large motor control centers.
Mounting and integration
The 3VA2040-6JQ36-0AA0 measures 181 mm high, 105 mm wide, and 86 mm deep. It fits standard panel-mount cutouts for 3-pole MCCBs in distribution boards or motor control centers. The communication function allows it to report status over a fieldbus or digital I/O link, reducing the need for separate auxiliary contact blocks in monitored panels.
Environmental range and power loss
Operating temperature range is -25 °C to 70 °C; storage range is -40 °C to 80 °C. Maximum power loss at rated current is 2.2 W — negligible for thermal budgeting in a crowded enclosure.