Siemens 3RT1966-4G Contactor Terminal Block Assembly

Siemens 3RT1966-4G is a Sirius box terminal block accessory designed to mount alongside the 3RT1 family of contactors to bring external wiring into the control circuit with a dedicated termination point, enabling tidy, code-compliant field wiring within a compact block that fits the standard Sirius frame. This model is specified for use with 3RT1 variants such as 3RT1.6 and 3RT1.7, and is associated with the 3RB106 overload relay in configurations that pair a contactor with a protection device, offering a coordinated solution within the Sirius modular system. Industry Mall documentation lists the part as a box terminal block for 3RT1, 3RB2, and 3RW507 configurations, reflecting its role as a standard accessory that enables reliable termination of field wires in motor-control panels, simplifies component replacement, and helps maintain consistent wiring conventions across assemblies. As a Siemens product, 3RT1966-4G carries the brand's SIRIUS designation and is designed for use in low-voltage control circuits within industrial automation environments, where panel builders require a compatible, purpose-built terminal interface to connect control signals and protective devices alongside the main contactor.