Siemens 3RT1975-5AF31 Changeover Mechanism for 3RT107/3RT147 Contactors, 110-127V AC/DC, SIRIUS Original Brand New

Overview: Reliable Control for SIRIUS Contactors

The Siemens 3RT1975-5AF31 is a high-performance changeover operating mechanism (solenoid coil) specifically designed for use with Siemens SIRIUS 3RT107 and 3RT147 power contactors. This essential spare part ensures reliable switching and control functions within industrial automation and motor control applications.

Engineered with versatility in mind, the mechanism supports both AC (50/60 Hz) and DC operation with a wide control supply voltage range of 110 V to 127 V. It utilizes a robust Standard/Economy circuit design for optimal power consumption and longevity. Installation is straightforward and secure, featuring dependable screw terminal connections.

Technical Specification

• Product Designation: Changeover Operating Mechanism / Magnet Coil
• Compatibility: Designed for Siemens 3RT107 and 3RT147 contactors (typically Size S12).
• Control Supply Voltage: 110…127 V AC/DC (Dual-voltage compatibility)
• Frequency: 50 Hz / 60 Hz
• Operating Mechanism: Standard, economy circuit (optimizes holding power and reduces energy consumption after initial pull-in)
• Connection Type: Screw Terminal for secure and robust wiring.
• Product Brand Name: SIRIUS
• Type of Voltage: AC/DC

Function

The 3RT1975-5AF31 changeover operating mechanism acts as the solenoid coil within the power contactor (3RT107 or 3RT147). Its primary function is to:

1. Generate a magnetic field when control voltage (110-127V AC/DC) is applied.
2. Pull-in the armature to close the main power contacts, initiating the motor load.
3. Maintain the closed state using the low-power “economy circuit” until the control voltage is removed.

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