3RT2926-3AP31

Description

Overview

The Siemens 3RT2926-3AP31 is a high-quality mechanical latch accessory from the Siemens SIRIUS family, engineered for S0-size contactors. It is designed for 230 V AC or DC control voltage and is compatible with the 3RT202, 3RT232 and 3RT252 contactor series.
This latch module enables secure mechanical interlocking of switch-state changes, helping to prevent unwanted or unintended operation of the connected contactors—especially valuable for motor‐control and industrial automation installations.

Key Features & Function

• Designed for 230 V AC/DC control voltage operation, offering flexibility in both AC and DC systems.

• Compatible with Siemens SIRIUS S0-size contactors: models 3RT202, 3RT232 and 3RT252.

• Simple “snap-on” mounting design for easy integration onto the contactor front plate, allowing fast installation and service.

• Robust mechanical interlock: ensures that the contactor remains locked in its current state in the event of a power loss or voltage drop, increasing operational safety and reliability.

• IP 20 protection class (front) — designed for industrial indoor environments, providing basic dust protection while maintaining cost-efficiency.

Benefit

• Improved Safety & Reliability: By mechanically latching the contactor, the system resists unintended switching, power-loss oscillations or mis-operation—especially important in critical motor-control applications.

• Reduced Downtime: The simple, modular design enables fast replacement or retrofit of the latch without need for large rewiring or structural changes.

• Compatibility & Flexibility: Works with a wide range of S0-size contactors in the Siemens SIRIUS range—makes inventory and spares management simpler.

• Cost-Effective Solution: Rather than replacing entire contactor assemblies when interlock issues arise, this latch module gives an economical upgrade path.

• Global Use: With AC/DC 230 V rating, the unit is suitable for many industrial markets worldwide where 230 V supply is standard.

Technical Specification

• Part Number: Siemens 3RT2926-3AP31

• Control Voltage (Rated): 230 V AC/DC

• Contactor Size: S0

• Compatible Contactors: 3RT202, 3RT232, 3RT252

• Weight: approx. 0.125 kg (net)

• Country of Origin: Germany

• Compliance: RoHS since 01.10.2009

Application

Ideal for installation in motor-control centers, panel boards or automation cabinets where S0-size contactors are deployed and a mechanical latch is required for safety or process integrity. Use this module to retrofit or maintain assemblies involving the 3RT202 / 3RT232 / 3RT252 contactor families.
For example:

• Industrial pump control systems

• HVAC motor starters

• Conveyor motor sections in manufacturing lines

• Switchgear or control panel upgrades requiring reliable interlock after a power drop

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