Siemens 3RH21222BB40 Contactor Relay

Product Description

The SIEMENS 3RH21222BB40 is a contactor relay designed for use in industrial control circuits. Contactor relay modules bridge low-current signal circuits and higher-load switching applications, allowing control system logic to actuate downstream contactors, starters, or auxiliary devices. This unit weighs 0.65 pounds and measures 2.894 inches long by 1.969 inches wide by 3.051 inches high, making it a compact fit within standard control enclosures. Installation is performed by licensed electricians or qualified industrial maintenance technicians working on motor control centers, control panels, or automation assemblies.

The 3RH21222BB40 is suited for industrial control panel applications where auxiliary relay switching is required. Typical installations include motor control centers, machine tool panels, and process automation cabinets. The compact footprint allows it to be mounted alongside other SIEMENS SIRIUS control components on DIN rail or panel-mounted assemblies. It is appropriate for both new construction control panels and retrofit or replacement work in existing industrial electrical systems.

Key Features

• Compact contactor relay format fits standard industrial control enclosures
• Dimensions of 2.894 x 1.969 x 3.051 inches support dense panel layouts
• Lightweight at 0.65 pounds for easy handling during installation
• Designed for auxiliary and signal switching in industrial control circuits
• Compatible with DIN rail and panel mounting configurations typical of SIRIUS product lines

Compatibility

Designed as an OEM-style contactor relay for use in industrial control panel and motor control center applications requiring auxiliary relay switching.

Installation Notes

Installation should be performed by a licensed electrician or qualified industrial technician in accordance with the NEC and applicable local codes. De-energize and lock out the control panel before handling or wiring this relay. Verify coil voltage and contact configuration match the circuit design before energizing. Do not exceed the rated switching capacity of the relay contacts.

Technical Specifications

• Weight: 0.65 pounds
• Length: 2.894 inches
• Width: 1.969 inches
• Height: 3.051 inches
• Package Quantity: 1 per pack
• UPC: 66264390365

Standard Information

• Brand: SIEMENS
• Manufacturer Part Number: 3RH21222BB40