3RT1936-1TR00

The Siemens SIRIUS S2 and S3 size contactor diode surge suppression assembly is designed for DC 24V coil circuits. It does not include an LED indicator and is installed at the bottom of the contactor. It can absorb back EMF surges when the coil is de-energized, protecting nearby relays and electronic components for safe operation.

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Siemens 3RT1936-1TR00 SIRIUS contactor diode surge suppression assembly DC24V

Product Positioning

The 3RT1936-1TR00 is a diode surge suppression component used in Siemens SIRIUS large series S2 and S3 size contactors. It is specifically designed for DC 24V coils and does not include LED indicator functionality. This component is mounted on the bottom of the contactor and absorbs surge voltages generated by inductive effects when the coil is de-energized, reducing the risk of damage to surrounding PLC output points or relay contacts. It is a common protective accessory for control panels using DC coil contactors.

Core Product Advantages and Features

Diode surge protection

Absorbs the induced surge during the moment the DC coil is de-energized, protecting nearby electronic components.

Corresponding DC24V circuit

Designed specifically for DC 24V coil contactors; not suitable for AC circuits.

Bottom mounting design

It does not occupy the terminal space above the contactor, and the installation position is fixed.

Version without LED

No surge status indicator light; if an indicator function is required, please contact us for a model with LED functionality.

Applicable to S2 and S3 sizes

Covering two common frames of SIRIUS large contactors

project	Specification
Product Type	Diode surge suppression component (excluding LED indicator)
Applicable power supply	DC 24V
Applicable contactor size	S2, S3
Installation method	Contactor bottom mounting
Function	Suppressing induced surge voltage at the moment of coil de-energization to protect the control circuit.

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3RT1936-1CD00

The Siemens SIRIUS S2 and S3 size contactor uses an RC surge absorber, which is compatible with AC 127 to 240V or DC 150 to 240V coil circuits. It is installed on the contactor coil terminals and can reduce the interference and impact of surges on surrounding control components during power failure.

3RT1936-1CC00

RC surge absorbers for Siemens SIRIUS S2 and S3 size contactors are compatible with AC 48 to 127V or DC 70 to 150V coil circuits. They are installed on the coil terminals to absorb surge voltage during power outages. They are suitable for switchboard designs using medium voltage control circuits and PLC output modules.