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Siemens 3RT2027-1FB44-3MA0 Contactor — 32A 15kW 24V DC Diode

Siemens 3RT2027-1FB44-3MA0 3-pole DC power contactor with diode.

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ManufacturerSiemens

Part number3RT2027-1FB44-3MA0

Type AC-3e/AC-3

Current Rating 32A

Power 15 kW @ 400V

Poles 3

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32A current capacity 15kW power handling 24V DC coil Plugged-in diode combination 2 NO + 2 NC auxiliary contacts Captive auxiliary switch

Product description

The Siemens 3RT2027-1FB44-3MA0 is a high-performance 3-pole power contactor for AC-3e/AC-3 applications, rated at 32 Amps and 15 kW at 400 Volts. It features a 24 Volt DC coil and comes with a plugged-in diode combination for coil de-energization protection. This model includes 2 normally open (NO) and 2 normally closed (NC) auxiliary contacts, utilizes screw terminals, and is built in size S0 with a captive auxiliary switch.

This contactor is designed for robust motor control and switching in industrial automation systems, particularly where DC control voltages are used and where additional auxiliary contacts are beneficial for complex control logic or feedback. The integrated diode combination suppresses back EMF, protecting control circuitry.

Source this specialized Siemens contactor, the 3RT2027-1FB44-3MA0, from Stanlo Automation, your reliable veteran-owned surplus parts provider. We ensure you receive quality components for your automation needs.

Technical specifications

Type	AC-3e/AC-3
Current Rating	32A
Power	15 kW @ 400V
Poles	3
Coil Voltage	24V DC
Features	Plugged-in Diode Combination, Captive Auxiliary Switch
Aux Contacts	2 NO + 2 NC
Terminals	Screw
Size	S0

Common applications

Motor control

Industrial automation

Control panels

DC control circuits

Systems requiring feedback

Compatible systems

24V DC control circuits Siemens SIRIUS 3RT2 accessories Motor control with DC coils

Also known as

Siemens 3RT2027 DC SIRIUS 3RT2027 diode 3RT2027-1FB44-3MA0 contactor

Replaces / compatible with

Compatible with Siemens 3RT2 series accessories. The diode combination replaces the need for an external suppression module for coil de-energization.

Technical note

Expert tip

The captive auxiliary switch ensures that the auxiliary contacts remain attached even when the main contactor module is actuated, providing reliable signaling.

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Frequently asked questions

What is the benefit of the 'plugged-in diode combination' on the 3RT2027-1FB44-3MA0?

The plugged-in diode combination on the 3RT2027-1FB44-3MA0 provides built-in protection against inductive voltage spikes (back EMF) generated when the DC coil is de-energized. This protects control components and eliminates the need for an external suppressor.