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Siemens 48DC38AA3 Bi-Metal Overload Relay - 30A, 3-Pole

Siemens 48DC38AA3 Bi-Metal Overload Relay

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ManufacturerSiemens

Part number48DC38AA3

Type Bi-Metal Overload Relay

Amperage Rating 30A

Number of Poles 3

Contact Configuration 1NC

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Bi-Metal Thermal Protection Ambient Compensated 3-Pole Configuration 1NC Auxiliary Contact Auto/Manual Reset Direct Mounting

Product description

The Siemens 48DC38AA3 is a 3-pole bi-metal overload relay designed for motor protection. It features a fixed 30 Amp rating and is ambient compensated for consistent performance across a range of temperatures. This relay includes a 1NC auxiliary contact and supports both auto and manual reset.

This overload relay is suitable for single-phase and polyphase motor applications, providing reliable thermal protection against overloads. It is a crucial component in motor control systems found in industrial and commercial settings.

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Technical specifications

Type	Bi-Metal Overload Relay
Amperage Rating	30A
Number of Poles	3
Contact Configuration	1NC
Reset Type	Auto/Manual
Mounting Type	Direct
Operating Temperature	-25 to 60 C
Standard	CUL, CSA

Common applications

Single-Phase Motors

Polyphase Motors

Motor Protection

Industrial Control

Commercial Applications

Compatible systems

Compatible with specific Siemens motor starters

Also known as

Siemens 48DC Overload Relay Class 48 Overload 30 Amp Overload Relay

Replaces / compatible with

Designed for direct mounting with compatible Siemens motor starters, ensuring seamless integration into control systems.

Technical note

Expert tip

This relay is ambient compensated, meaning it automatically adjusts for surrounding temperature variations, providing more consistent protection.

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Frequently asked questions

What is the contact rating for the Siemens 48DC38AA3 overload relay?

The Siemens 48DC38AA3 overload relay has a contact rating of B600/R300. It also includes a 1NC (Normally Closed) auxiliary contact for signaling or control purposes.