The Siemens 3VA2040-6HN46-0AA0 is a SENTRON molded case circuit breaker (MCCB) rated for 40 A continuous current with a maximum breaking capacity of 242 kA at 240 V. It carries 4 poles and is designed for line protection, using an ETU350 electronic trip unit for adjustable overcurrent release. The IP40 front protection means it's suited for enclosed panel mounting where splash ingress isn't expected.
Breaking capacity across voltages
This MCCB's interrupting rating drops with system voltage: 242 kA at 240 V, 187 kA at 415 V and 440 V, 121 kA at 500 V, and 3 kA at 690 V. The 3 kA at 690 V is the weak point — verify the available fault current at that voltage before specifying for 690 V applications.
Rated current and thermal performance
Continuous current rating holds at 40 A across the full operating temperature range from -25 °C to 70 °C, with no derating needed. The rated insulation voltage is 800 V. Power loss at rated load is 2.2 W maximum — negligible for panel thermal budgeting.
Dimensions and panel fit
Dimensions: 181 mm high, 140 mm wide, 86 mm deep. The 4-pole width of 140 mm is standard for SENTRON 3VA2 frames — verify the existing panel cutout and DIN rail alignment if replacing a different brand or older series. No undervoltage release or communication module fitted on this variant.