Self-Hold Thermal Protectors prevent contact breakage.

Press Release Summary:

Self-Hold Thermal Cut-Out and Thermal Protectors UB8P and UB81P provide overheat protection in high voltage applications. Ensuring continuous operation to setpoint, SMT devices feature partition wall design that isolates switch from main body to control arcing. Products, manufactured of phenolic resin, have 16 A capability and incorporate non-self resetting function. Model UB81P features reinforced PBT enclosure, while UB8P has exposed bi-metallic element.

Original Press Release:

Selco's New Self-Hold Thermal Protectors Prevent Contact Breakage in High Voltage Applications

ANAHEIM, Calif. - May 11, 2005 - Selco Products new UB8P and UB81P Self-Hold Thermal Cut-Out and Thermal Protectors are designed to provide overheat protection in high voltage applications. With a high 16 Amp capability, the new models are well suited for thermal overload protection in a broad range of applications, including space heaters, dishwashers, mixers, blenders, grinders and other electronic appliances.

The body of these surface mount devices are manufactured of phenolic resin and feature a new patent pending partition wall design that isolates the switch from the main body. This design effectively controls arcing that can cause a break in voltage contact (particularly in 250V applications), ensuring continuous operation to setpoint. The UB81P features a reinforced PBT enclosure for dust-proof applications; the UB8P has an exposed bi-metallic element for high accuracy and fast response to ambient air temperature.

Both models incorporate a "self-hold" non-self resetting function that provides a high level of operational safety, especially in appliances with moving parts. The "self-hold" function ensures that after the element reaches its pre-set open temperature, the internal heater activates to maintain a self-regulating temperature, preventing the switch from resetting until the user disconnects the power.

Measuring 31.5 mm x 6.5 mm x 4.2 mm, the UB8P and UB81P feature an operating temperature set range from 75 to 145°C. Temperature tolerances are ± -5, ± -7, and ± -10°C with a standard differential of 30°C±15°C. Contact ratings are 16 Amps at 125V and 10 Amps at 250VAC to 6,000 cycles.

The UB8P and UB81P Models are manufactured with a built-in ceramic PTC (positive temperature coefficient) self-regulating heating element, which is positioned directly next to the bimetal-sensing switch. This design provides efficient insulation and fast thermal response time compared to units where the heater is mounted externally to the thermostat.

Agency approvals include a UL rating of 16 Amps at 125VAC, 6,000 cycles resistive down to 125°C and a European rating of 10 Amps (5A) at 250VAC, 6,000 cycles resistive (inductance) down to 125°C. The UB8P/UB81P is priced from $1.50 each in production quantities of 10,000 pieces with delivery in 6 to 8 weeks.

For further information on the entire line of Selco thermostats, thermistors, electronic controls, knobs, and digital panel meters, contact Selco/ECC, 605 South East Street, Anaheim, Calif., 92805-4842; Toll-Free: (800) 229-2332; E-mail:; Web site:

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