3RT20162FB443MA0

The 3RT2016-2FB44-3MA0 belongs to the Siemens SIRIUS 3RT2016 series. It is an AC-3 rated 9A, 4kW/400V, 24V DC coil with a built-in freewheeling diode to suppress power failure surges. It features spring-loaded (screwless) terminals with two sets of normally open and two sets of normally closed auxiliary contacts fixed at the factory, making it suitable for PLC DC control circuits.

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Siemens 3RT2016-2FB44-3MA0 DC contactor, 9A, 4kW, 24VDC, 2NO2NC, built-in diode.

Product Positioning

The 3RT2016-2FB44-3MA0 is a DC diode protection model in the SIRIUS 3RT2016 series, designated with the coil code 'F'. Compared to the standard B-type DC coil, the F-type coil integrates a freewheeling diode, which can absorb induced surges when the coil is de-energized, reducing interference to surrounding electronic circuits (such as PLC output modules) and the risk of component damage. The correspondence between this 'F' code and the diode is clearly indicated in the 2FB44-3MA0 catalogs of the 3RT2017 and 3RT2018 series. This model features a spring-loaded terminal design, allowing for quick crimping of wires without a screwdriver. It also comes pre-installed with four auxiliary contacts: two normally open (NO) and two normally closed (NC), facilitating the simultaneous removal of the start indicator and interlock protection signal.

Core Product Advantages and Features

24V DC built-in diode coil

The coil, designated F, integrates a freewheeling diode, which can suppress induced surges when the coil is de-energized. Compared to the B-type coil without a diode, it is more suitable for use with PLCs or semiconductor drive circuits.

2NO+2NC auxiliary contacts

It comes pre-installed with 4 auxiliary contacts (2 normally open + 2 normally closed), which can simultaneously provide operation feedback and interlock protection signals, eliminating the need to purchase auxiliary contact modules separately.

Spring-loaded quick-connect terminal

Both the main circuit and the control circuit use spring clip terminals, which can complete the wiring without screws, making it suitable for applications with a large number of wires or those that require frequent maintenance and replacement.

AC-3 9A/4kW main contacts

It shares the same S00 frame main contact specifications as the 3RT2016 series, with a rated current of 9A and 4kW at 400V, suitable for small pumps, fans and other loads.

project	Specification
model	3RT2016-2FB44-3MA0
Rated current (AC-3)	9 A
Rated power (400V, AC-3)	4 kW
Number of poles/main contacts	3 poles, 3 sets of normally open (NO) terminals
coil voltage	24V DC (built-in freewheeling diode)
auxiliary contacts	2 sets of normally open + 2 sets of normally closed (2NO + 2NC), factory fixed.
Terminal type	Spring-loaded (screwless) terminals
Casing Specifications	S00 framework
Insulation voltage	690 V
Protection level	IP20 (Front)
Mechanical life	Approximately 30 million times (standard value)
Ambient temperature	-25°C ~ +60°C
Safety certification	UL, CSA

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