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Siemens 3RB2066-1GC2 SIRIUS Thermal Overload Relay - 55-250A

Siemens 3RB2066-1GC2 High-Capacity Overload Relay for motor protection.

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ManufacturerSiemens

Part number3RB2066-1GC2

Type Thermal Overload Relay

Current Range 55-250 A

Size S10/S12

Protection Class Class 10E

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High-capacity motor overload protection Adjustable current setting (55-250A) Class 10E tripping Supports Size S10/S12 contactors or stand-alone Busbar main connections Manual/Automatic reset

Product description

The Siemens 3RB2066-1GC2 is a high-capacity thermal overload relay from the SIRIUS 3RB20 series, engineered for robust motor protection. It offers an extensive adjustable current range of 55 to 250 A, suitable for Size S10/S12 contactors or stand-alone installations. This relay is rated for Class 10E protection, providing reliable performance for demanding applications. It features busbar connections for the main circuit and screw terminals for the auxiliary circuit, with options for manual or automatic reset.

This heavy-duty overload relay is designed for protecting large industrial motors in applications such as large pumps, industrial fans, crushers, and heavy machinery. It is essential in sectors like mining, power generation, heavy manufacturing, and large-scale material handling where high motor currents are common.

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Technical specifications

Type	Thermal Overload Relay
Current Range	55-250 A
Size	S10/S12
Protection Class	Class 10E
Mounting	Contactor Mounting / Stand-alone
Main Circuit Terminals	Busbar
Auxiliary Circuit Terminals	Screw
Reset	Manual/Automatic

Common applications

Large motor protection

Industrial fans

Pumps

Crushers

Heavy machinery

Mining equipment

Power generation

Compatible systems

Siemens SIRIUS 3RT contactors (Size S10, S12) Stand-alone mounting applications

Also known as

Siemens 3RB20 Overload Relay SIRIUS Overload Relay S10/S12 Siemens 55-250A Thermal Relay

Replaces / compatible with

This overload relay is designed for high-current motor protection and can be mounted directly onto compatible Siemens SIRIUS contactors or installed as a stand-alone unit.

Technical note

Expert tip

When using busbar connections, ensure proper torque and alignment for a secure and reliable electrical interface.

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Frequently asked questions

What type of connections does the Siemens 3RB2066-1GC2 overload relay use?

The Siemens 3RB2066-1GC2 overload relay features busbar connections for the main circuit, allowing for robust connection to larger contactors or power distribution systems, and screw terminals for the auxiliary control circuit.