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Siemens 3RT2028-1NB30 38A Contactor with Varistor

Siemens 3RT2028-1NB30 3-Pole Power Contactor

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ManufacturerSiemens

Part number3RT2028-1NB30

Type Power Contactor

AC-3e/AC-3 Rating 38 A

Power Rating 18.5 kW / 400 V

Poles 3

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Wide-range 21-28V AC/DC coil Integrated varistor 38A AC-3e/AC-3 rating 1 NO + 1 NC auxiliary contacts Screw terminals Size S0

Product description

The Siemens 3RT2028-1NB30 is a versatile 3-pole power contactor for AC-3e/AC-3 applications, rated for 38A and 18.5 kW at 400V. It features a wide-range coil voltage of 21-28V AC/DC and includes an integrated varistor for surge suppression. This model is equipped with 1 normally open (NO) and 1 normally closed (NC) auxiliary contact.

This contactor is ideal for applications where a flexible coil voltage range is needed, or where the control voltage might fluctuate between AC and DC within the specified range. The integrated varistor offers protection against voltage spikes. It is commonly used in motor control, industrial automation, and power switching applications requiring a reliable switching device.

Source the Siemens 3RT2028-1NB30 from Stanlo Automation. As a veteran-owned distributor of surplus industrial automation parts, we offer cost-effective solutions and dependable service to keep your operations running smoothly.

Technical specifications

Type	Power Contactor
AC-3e/AC-3 Rating	38 A
Power Rating	18.5 kW / 400 V
Poles	3
Coil Voltage	21-28 V AC/DC
Frequency	50/60 Hz
Varistor	Integrated
Auxiliary Contacts	1 NO + 1 NC
Terminals	Screw
Size	S0

Common applications

Motor control

Industrial automation

Control panels

Power distribution

Flexible voltage applications

HVAC systems

Compatible systems

Siemens Sirius 3RT Series Control systems requiring 21-28V AC/DC coil voltage and integrated surge protection

Also known as

Siemens 3RT2028 Wide-range Contactor 3RT2028 Contactor 21-28V Siemens Sirius

Replaces / compatible with

Suitable for replacing Siemens 3RT2028 models with similar ratings but requiring a wider AC/DC coil voltage range or integrated surge suppression. Verify specifications.

Technical note

Expert tip

The integrated varistor provides effective suppression of transient overvoltages on the coil, protecting connected control electronics.

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Frequently asked questions

What is the coil voltage range for the Siemens 3RT2028-1NB30?

The Siemens 3RT2028-1NB30 features a versatile coil voltage range of 21-28V AC/DC. This allows for flexibility in applications with varying control voltages.