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Siemens 3UA5500-0K Thermal Overload Relay

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ManufacturerSiemens

Part number3UA5500-0K

Type Thermal Delayed Overload Relay

Series 3UA55

Mounting Direct mount onto contactor

Current Setting Range 0.3-0.5A

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12-month warranty

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Veteran-owned

CAGE: 9NK75

Thermal overload protection Direct mounting Very low adjustable current setting Auxiliary contacts Compact design

Product description

The Siemens 3UA5500-0K is a thermal delayed overload relay designed for direct mounting onto Siemens contactors. It features a very low adjustable current setting range of 0.3A to 0.5A and includes one normally open (NO) and one normally closed (NC) auxiliary contact.

This relay is ideal for protecting small motors, control transformers, or other devices that require precise overload protection at very low current levels. Its applications can include small fans, auxiliary circuits, and specialized control systems.

Stanlo Automation, a veteran-owned supplier of surplus industrial automation parts, offers the Siemens 3UA5500-0K. We ensure quality and availability, providing cost-effective solutions for your MRO requirements.

Technical specifications

Type	Thermal Delayed Overload Relay
Series	3UA55
Mounting	Direct mount onto contactor
Current Setting Range	0.3-0.5A
Auxiliary Contacts	1 NO + 1 NC

Common applications

Small Motor Protection

Control Transformer Protection

Auxiliary Circuit Protection

Low Current Applications

Automation Systems

Compatible systems

Siemens 3RT contactors Siemens Sirius line

Also known as

Siemens 3UA55 0.3-0.5A Overload 3UA55000K Relay

Replaces / compatible with

Designed for use with Siemens contactors, suitable for applications needing precise overload protection for very low current loads.

Technical note

Expert tip

This relay is particularly useful for protecting control circuits where small inductive loads might cause nuisance tripping on larger overload relays.

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Frequently asked questions

What is the purpose of the 3UA5500-0K relay for very low current settings?

The Siemens 3UA5500-0K is designed for applications requiring overload protection for loads drawing very small currents, such as small control transformers or pilot devices. Its 0.3A to 0.5A setting range provides precise protection where standard relays would not be sensitive enough.