RP Series Thermal Protectors

Introduction

Sensata Technologies’ RP Series Thermal Protectors are fixture-mounted bi-metal devices designed for recessed luminaires. The series combines insulation-contact detection with thermal-condition monitoring, supporting protection requirements for both insulation-contact (IC) and non-insulation-contact (non-IC) lighting fixtures.

A notable aspect of the RP Series is its coverage of dedicated-voltage and multi-tap ballast arrangements, alongside automatic reset operation and a fault-condition light for indicating an abnormal condition.

What it does

RP Series protectors monitor the thermal and insulation conditions associated with recessed luminaire installations. They are intended to help distinguish between IC and non-IC installation conditions while providing thermal protection for the fixture.

The devices use bi-metal technology and automatically reset after operation. Sensitivity is available from low to high, allowing the protection approach to be matched to the fixture’s thermal requirements.

The series supports 50 Hz and 60 Hz operation, with a stated heating capability from 12 V to 277 V and a maximum capability of 480 V AC. Configuration options include:

• 3-wire RP versions for dedicated-voltage configurations
• 4-wire RP versions for multi-tap ballast configurations

A fault-condition light is included as part of the series’ monitoring functionality.

Applications

Potential uses that follow directly from the product’s stated function include:

• Recessed lighting fixtures requiring thermal-condition monitoring
• IC-rated recessed luminaires installed in contact with insulation
• Non-IC recessed luminaires requiring insulation-detection functionality
• Fixtures using dedicated-voltage ballast configurations
• Fixtures using multi-tap ballast configurations
• Luminaire designs where a visible fault-condition indication is useful

Design considerations

The RP Series is intended for fixture mounting, so fixture mechanical design must accommodate its mounting arrangement. The specified knockout hole is 7/8 in, for wall thicknesses from 0.032 in to 0.078 in. The clip is made from spring steel.

Electrical integration depends on the ballast arrangement: dedicated-voltage designs use the 3-wire RP configuration, while multi-tap ballast designs use the 4-wire RP configuration. Designers should also account for the applicable voltage and frequency limits, as well as the required thermal sensitivity level.

The supplied compliance information identifies UL, CSA, and NEC, with a UL certification cycle rating of 10,000 cycles.

Availability and further information

Further technical information is available through the Mouser Electronics source link and the Sensata Technologies datasheet link provided on this page.