Transformer-protection circuit breaker, SIRIUS 3RV6411-1JA10
Its Trip Class 10 thermal overload release and magnetic short-circuit trip are sized for the inrush characteristics of control transformers and similar inductive loads — the thermal curve matches the heating time constant of a transformer winding, so nuisance tripping on magnetizing inrush is minimized. Rated operational frequency is 50 to 60 Hz, and total power loss is 7 W — a figure to include in enclosure thermal calculations when the breaker is grouped with other SIRIUS components.
Integration and mounting details
Size S00 frame (96 mm depth, 45 mm width, 97 mm height) with screw-type terminals on top and bottom for the main current circuit. Terminals accept 2x (0.75 to 2.5 mm²) solid or stranded, or 2x 4 mm² solid; AWG equivalents are 2x (18 to 12) and 2x (20 to 16). Tightening torque for main contacts is 0.8 to 1.2 N·m. Clearance requirements: 50 mm upwards, 50 mm downwards, 30 mm at the side; zero clearance forwards or backwards — useful for panel layout when grouping multiple breakers.
Relative humidity during operation spans 10 to 95 %. Shock resistance rated at 25 g / 11 ms per IEC 60068-2-27, and surge voltage resistance at 6 kV. Maximum installation altitude is 2 000 m above sea level. Substance prohibitance (RoHS) compliance date is 05/01/2012, indicating the part meets EU RoHS requirements from that date forward.