3RT2023-1FB44-3MA0

The Siemens 3RT2023-1FB44-3MA0 combines a plug-in diode surge suppression coil with 2NO+2NC non-removable auxiliary contacts, designed according to Swiss SUVA safety standards, and is suitable for safety interlocking circuits.

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Siemens 3RT2023-1FB44-3MA0 DC24V Diode Suppression 2NO+2NC Fixed Auxiliary Contact Electromagnetic Contactor

Product Positioning

The 3RT2023-1FB44-3MA0 is a special version of the SIRIUS 3RT2 S0 frame contactor, incorporating two additional designs: firstly, a plug-in diode suppression element is added to the coil circuit to effectively suppress surge voltage generated when the DC24V coil is de-energized; secondly, the "-3MA0" code at the end of the model number indicates that this product is equipped with a non-removable fixed auxiliary contact group (2NO+2NC) manufactured according to Swiss SUVA safety standards. This ensures that the correspondence between the auxiliary contact state and the main contact action will not be inaccurate due to replacement of the contact module, and is commonly used in safety-related circuits requiring reliable interlocking feedback. The main circuit maintains the standard S0 frame AC-3 rated 9A/4kW specification, and the wiring method is a traditional threaded terminal block.

Core Product Advantages and Features

Plug-in diode surge suppression

The coil circuit has a built-in pluggable diode suppression combination, which can reduce surge interference when the DC24V coil is de-energized and protect adjacent control circuits.

SUVA Safety Specification Fixed Auxiliary Contact (-3MA0)

The auxiliary contact assembly is designed according to the Swiss SUVA safety application specifications and is permanently fixed to the main body. It cannot be replaced like the standard model, ensuring the reliability of contact status feedback.

2NO+2NC auxiliary contacts

The fixed auxiliary contacts provide two sets of normally open and two sets of normally closed contacts, which are suitable for safety circuit designs that require multiple interlocking signals.

S0 frame, AC-3 9A/4kW

The AC-3 three-pole main contact has a rated current of 9A and a rated power of 4kW at 400V. It features threaded terminal wiring and conforms to IEC/EN 60947-4-1.

project	Specification
model	3RT2023-1FB44-3MA0
Coil rated voltage	DC 24 V
Coil type	DC electromagnetic coil with built-in plug-in diode suppression
Auxiliary contact configuration	2 NO + 2 NC, permanently fixed (non-replaceable)
Special Specifications	Manufactured in accordance with Swiss SUVA safety application standards (order code suffix -3MA0)
Wiring method	Screw terminal
Rated operating current Ie (AC-3, 400V)	9 A
Rated operating power (AC-3, 400V)	4 kW
Main contact pole number	3-pole (3NO)
Contactor size class	S0
Rated insulation voltage Ui	690 V
Mechanical life	10 million cycles