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Siemens 3RT2027-1BB40 SIRIUS Power Contactor — 32A 15kW 24V DC Coil

Siemens 3RT2027-1BB40 3-pole power contactor, 32A, 15kW, 24V DC coil.

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ManufacturerSiemens

Part number3RT2027-1BB40

Type Power Contactor

Poles 3

AC-3e/AC-3 Rating 32A

Max Power (400V) 15 kW

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AC-3e/AC-3 rating 32A switching current 15kW power capacity 24V DC coil 1 NO + 1 NC auxiliary contacts Screw terminals

Product description

The Siemens 3RT2027-1BB40 is a 3-pole power contactor for AC-3e/AC-3 applications, rated for 32A and 15kW at 400V. This model is distinguished by its 24V DC coil, making it suitable for control systems powered by direct current. It includes 1 normally open (NO) and 1 normally closed (NC) auxiliary contacts and utilizes screw terminals for secure connections. This size S0 contactor is a reliable component for DC-controlled switching.

This DC-coil contactor is ideal for applications where DC control voltage is prevalent, such as in some battery-powered systems, specialized industrial machinery, or integrated control cabinets. Industries like material handling, water treatment, and emergency systems can utilize this part.

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Technical specifications

Type	Power Contactor
Poles	3
AC-3e/AC-3 Rating	32A
Max Power (400V)	15 kW
Coil Voltage	24V DC
Auxiliary Contacts	1 NO + 1 NC
Terminal Type	Screw
Size	S0

Common applications

DC control systems

Industrial machinery

Material handling

Water treatment plants

Control cabinets

Automation projects

Compatible systems

Designed for use within Siemens SIRIUS motor protection and control systems, compatible with DC control voltages.

Also known as

Siemens 3RT2027 Contactor SIRIUS 3RT2027-1BB40 32A 24V DC Contactor

Replaces / compatible with

This contactor is part of the Siemens SIRIUS 3RT2 series and serves as a replacement for other Siemens contactors with 24V DC coils and similar current/power ratings.

Technical note

Expert tip

When using DC coils, ensure the control voltage supply is stable and within the specified tolerance for the 24V DC coil to prevent premature failure or erratic operation.

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Frequently asked questions

Why would I choose a 24V DC coil contactor like the 3RT2027-1BB40?

A 24V DC coil contactor like the Siemens 3RT2027-1BB40 is chosen for systems that operate on direct current for control purposes. This is common in applications where low-voltage DC is readily available or preferred for safety and integration with DC control circuitry.