The Siemens 3TF20 10-0BV4 is a size S00, three‑pole AC‑3 contactor from the Siemens 3TF2 family, designed to switch three‑phase motors. In size 00 configurations it is rated up to 4 kW at 400 V (AC‑3) with screw terminals and includes an auxiliary contact (10E, 1 NO); the unit can accommodate a diode or varistor for surge protection. Related 3TF20 variants use a DC coil, with 24 V DC being common for suffixes such as 10-0BB4, reflecting the family’s DC‑coil options while preserving the three main contacts.
