The Siemens SIRIUS 3RT1946-4GA07 is a Type E terminal block designed for use with circuit breakers in Size S3. It provides increased clearances and creepage distances for combination motor controllers per UL 508. The screw-type terminals accept solid conductors 2x (2.5... 16 mm²) and stranded conductors up to 1x (10... 70 mm²), with an ampacity maximum of 100 A and an insulation voltage of 690 V at pollution degree 3.
The 100 A ampacity and 690 V insulation voltage set the electrical envelope for this terminal block — it handles the full rated current of a Size S3 circuit breaker without derating in standard industrial environments. The Type E designation (UL 508) means the clearances and creepage distances are increased beyond standard terminal blocks, which is required for combination motor controller assemblies where the block mounts directly to the breaker output. The IP20 finger-safe front (per IEC 60529) protects against accidental contact from the front, which matters in open-panel installations where maintenance staff may reach near live terminals.
At 70 mm width, this block matches the standard S3 breaker footprint and mounts directly to the breaker terminals via screw-type connections. The terminal accepts solid and stranded conductors across the ranges listed, including AWG equivalents for main contacts: 2x (10... 1/0) and 1x (10... 2/0).