SENTRON 3VA2125-7HL36-0AC0 — 25 A MCCB for Line Protection
The Siemens 3VA2125-7HL36-0AC0 is a SENTRON molded case circuit breaker (MCCB) rated for 25 A continuous current in a 3-pole configuration, designed specifically for line protection duty. Its breaking capacity reaches 330 kA at 240 V AC and 242 kA at 415 V AC, dropping to 3.7 kA at 690 V AC — the voltage-dependent curve means you size the interrupting rating against the actual fault level at the installation point, not the highest number on the label. Rated insulation voltage is 800 V, giving headroom for 480 V and 600 V class systems. The 25 A rating holds flat across the full ambient temperature range from -25 °C to 70 °C — no derating curve to calculate for warm enclosures. Power loss is 0.6 W maximum, negligible for panel thermal budget. The supplied basic switch is order code 3VA21257HL360AA0; the auxiliary switch complement is two HQ-style switches.
Physical Fit and Panel Integration
Dimensions are 105 mm wide × 181 mm high × 86 mm deep. The 105 mm width is the critical panel cutout dimension — verify against the existing MCCB mounting footprint if replacing a different brand. Depth of 86 mm is the body only; allow additional clearance for lug landing and arc-chamber venting per UL 489 / IEC 60947-2 installation rules. No undervoltage release, no voltage trip, and no communication function on this variant — it is a straight thermal-magnetic line-protection breaker with auxiliary switching only.