Siemens 5SY4305-7 Supplementary Protector 3P 0.5A 480V

Product Description

The SIEMENS 5SY4305-7 is a 3-pole supplementary protector rated for 480 VAC service at 0.5 amps with a Curve C trip characteristic. Supplementary protectors are used for overcurrent and short-circuit protection of individual loads and branch circuits in industrial control panels and equipment — they are not intended as branch-circuit protective devices under NEC Article 240. This unit is UL1077 rated and also meets IEC mini circuit breaker standards, making it suitable for both domestic and internationally specified panel builds. It measures 54mm in width and 70mm in depth and is listed under UL File E116386.

Typical applications include motor control centers, machine tool panels, HVAC equipment control enclosures, and industrial distribution panels where supplementary overcurrent protection of internal components is required. The Curve C trip characteristic handles moderate inrush loads and is appropriate for resistive and light inductive circuits. Electricians and panel builders working on UL508A-listed industrial control panels routinely specify this type of device for component-level protection.

Key Features

• 3-pole configuration provides simultaneous overcurrent protection across all three phases
• 0.5A continuous current rating suits low-load control circuits and instrumentation feeds
• Curve C trip characteristic handles moderate inrush without nuisance tripping
• UL1077 listed and IEC mini circuit breaker rated for broad specification compliance
• Compact 54mm width fits standard DIN rail panel layouts with minimal space impact
• UL File E116386 listing supports UL508A panel documentation requirements

Compatibility

Designed as an OEM-style supplementary protector for 3-pole 480 VAC industrial control panel applications requiring UL1077-rated overcurrent protection at 0.5 amps with a Curve C trip curve.

Installation Notes

Installation should be performed by a licensed electrician familiar with NEC requirements for supplementary protectors and industrial control panel wiring. De-energize and lock out the panel before installing or replacing this device. This protector is intended for supplementary protection of loads within equipment and must be used downstream of a branch-circuit protective device — it does not serve as a branch-circuit breaker. Verify DIN rail mounting clearances and that the panel enclosure rating matches the application environment before commissioning.

Technical Specifications

• Poles: 3
• Current Rating: 0.5 amps
• Voltage Rating: 480 VAC
• Trip Characteristic: Curve C
• Interrupt Rating: 5 kA
• Width: 54mm
• Depth: 70mm
• Standard: UL1077, IEC Mini Circuit Breaker
• UL File: E116386, Volume 1, Section 2
• UPC: 754554876320

Standard Information

• Brand: SIEMENS
• Manufacturer Part Number: 5SY4305-7