Key Features & Technical Parameters
1. General Specifications
Type: Electromechanical Miniature Contactor Relay

Rated Operational Current (Ie):

AC-1 (Resistive Loads): 5 A @ 250V AC

AC-3 (Motor Loads): 2.2 A @ 400V AC

Rated Operational Voltage (Ue):

AC: 230V/400V (50/60 Hz)

DC: 24V (control circuit)

Contact Configuration: 2 NO (Normally Open)

Mechanical Life: 10 million operations

Electrical Life:

AC-3: 300,000 operations

AC-1: 1 million operations

2. Coil & Control Data
Coil Voltage (Us): 24V DC (standard for this model)

Power Consumption:

DC Coil: ≈ 1.2 W

Switching Time: ≈ 8-12 ms

3. Mechanical & Environmental Data
Mounting: DIN rail (35 mm)

Protection Class: IP20 (requires enclosure)

Ambient Temperature Range: -25°C to +60°C

Housing Material: Flame-retardant thermoplastic (UL94 V0)

Dimensions (W×H×D): Approx. 18×45×55 mm

Typical Applications
✔ Control Circuits - PLC interfaces and automation systems
✔ Small Motor Control - Compact fans and pumps
✔ Lighting Systems - Switching of lighting loads
✔ HVAC Components - Control of dampers and small actuators

Ordering Information
3RH1122-1BB40 = Standard model with 24V DC coil and 2NO contacts

Alternative Versions:

3RH1122-1BB41 (110V AC coil)

3RH1122-1BB42 (230V AC coil)

Modern Alternatives
For new installations, Siemens recommends:

SIRIUS 3RT2015 (New generation contactors)

SIRIUS 3RP15 (Compact relays)

Installation Notes
Ensure proper coil voltage (24V DC for this model)

Suitable for control circuits up to 5A

Requires IP20 enclosure for protection

Follow SIRIUS 3RH1 installation guidelines