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Siemens 3RV2021-4EA15 S0 Motor Protection Breaker w/ Aux

Siemens 3RV2021-4EA15 S0 Motor Protection Breaker with Aux

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ManufacturerSiemens

Part number3RV2021-4EA15

Size S0

Motor Protection Yes

Class 10

A-Release 27-32 A

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12-month warranty

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Veteran-owned

CAGE: 9NK75

Motor protection Adjustable trip current Standard switching capacity Screw terminals 1 NO+1 NC auxiliary switches High current range

Product description

The Siemens 3RV2021-4EA15 is a size S0 motor starter protector, designed for motors requiring higher current protection and offering integrated auxiliary contacts. It features CLASS 10 protection, an adjustable A-release from 27A to 32A, and a 400A N-release. This model uses screw terminals and includes one normally open (NO) and one normally closed (NC) transverse auxiliary switch for signaling and control integration.

This breaker is ideal for protecting larger motors in demanding applications found in heavy industry, processing plants, and large-scale automation. The auxiliary contacts allow for seamless integration into control systems for status monitoring and interlocking.

Stanlo Automation, a veteran-owned supplier of surplus industrial automation parts, carries the Siemens 3RV2021-4EA15. We pride ourselves on offering competitive pricing and fast delivery to minimize your downtime. Choose Stanlo for reliable automation components and exceptional service.

Technical specifications

Size	S0
Motor Protection	Yes
Class	10
A-Release	27-32 A
N-Release	400 A
Terminals	Screw
Aux Switches	1 NO + 1 NC
Switching Capacity	Standard

Common applications

Large motor control

Automation systems

Pump controls

Fan controls

Signaling circuits

Heavy industry

Compatible systems

PLC systems Control panels Motor starter assemblies Industrial automation equipment Signaling systems

Also known as

Siemens 3RV2021-4EA15 3RV20214EA15 Siemens S0 breaker 27-32A aux

Replaces / compatible with

Compatible with Siemens 3RV2 series motor protection and control systems.

Technical note

Expert tip

When using the 3RV2021-4EA15 in a motor starter combination, ensure proper coordination with downstream protective devices to guarantee selective tripping.

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Frequently asked questions

What are the auxiliary contacts on the Siemens 3RV2021-4EA15 used for?

The Siemens 3RV2021-4EA15 includes 1 NO and 1 NC transverse auxiliary contacts. These are typically used for remote signaling of the breaker's status (e.g., tripped or closed) or for interlocking within a control system.