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Siemens 3RT2023-2FB40 9A 3-Pole Contactor with Diode

Siemens 3RT2023-2FB40 9A 3-pole power contactor with 24V DC coil and diode suppression.

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ManufacturerSiemens

Part number3RT2023-2FB40

Poles 3

AC-3e/AC-3 Rating 9 A

Power Rating 4 kW / 400 V

Coil Voltage 24 V DC

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AC-3e/AC-3 rated 9A current capacity 24V DC coil 1 NO + 1 NC auxiliary contacts Spring-loaded terminals Diode coil suppression

Product description

The Siemens 3RT2023-2FB40 is a 3-pole power contactor rated for AC-3e/AC-3 duty, handling 9A and 4kW at 400V. It features a 24V DC coil and incorporates a plugged-in diode combination for coil suppression, which reduces inductive voltage spikes when the coil is de-energized. This size S0 contactor comes with 1 normally open (NO) and 1 normally closed (NC) auxiliary contact and uses spring-loaded terminals for secure and fast connections.

This contactor is ideal for applications where coil protection against voltage spikes is critical, such as in automation systems with frequent switching or sensitive electronic controls. The diode combination offers a faster response time compared to varistors. It is commonly used in motor control circuits, automation systems, and machinery in industries like packaging, food processing, and general manufacturing.

Stanlo Automation, a veteran-owned distributor of surplus industrial automation parts, offers the Siemens 3RT2023-2FB40. We are committed to providing quality surplus components with competitive pricing and rapid shipping to meet your automation needs.

Technical specifications

Poles	3
AC-3e/AC-3 Rating	9 A
Power Rating	4 kW / 400 V
Coil Voltage	24 V DC
Auxiliary Contacts	1 NO + 1 NC
Terminals	Spring-loaded
Size	S0
Protection	Plugged-in diode combination

Common applications

Motor control

Automation systems

Industrial machinery

Packaging machinery

Food processing

Control panels

Compatible systems

Control Systems with Sensitive Electronics Automation Panels Industrial Machinery

Also known as

Siemens 3RT2023-2FB40 Contactor Siemens S0 Diode Contactor 3RT20 Contactor

Replaces / compatible with

This unit can replace other Siemens 3RT2023 series contactors with 24V DC coils and similar specifications. The diode suppression is beneficial in systems sensitive to inductive spikes.

Technical note

Expert tip

The diode suppression in the 3RT2023-2FB40 has a response time of approximately 20 ms, which is faster than varistor suppression but slower than electronic suppression modules.

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Frequently asked questions

How does the diode combination on the 3RT2023-2FB40 protect the coil?

The plugged-in diode combination on the 3RT2023-2FB40 acts as a freewheeling diode, clamping inductive voltage spikes generated when the coil is de-energized, thus protecting the coil and connected control circuitry.