PTC (Positive Temperature Coefficient) semiconductor heater for self-regulating anti-condensation and enclosure heating
Rated wattage 3.7W at 220V AC with maximum current draw of 0.017A at rated voltage
Resistance range 500Ω to 2kΩ at 25°C
Operating voltage 220V AC; maximum permissible current 2A
Self-regulating surface temperature stabilises at 85±10°C through the PTC domino effect
Insulation resistance DC 500V, 20MΩ minimum
Withstanding voltage AC 3750V for 2 minutes with maximum leakage current 1mA
Life cycle verified to ±10% performance change over 2000 minutes continuous operation at rated voltage
Pre-attached UL1332 22AWG black power lead wires with plastic lead wire pipes
RoHS compliant
What are the YB Series PTC Heaters?
The YB series are PTC (Positive Temperature Coefficient) heaters built from functional semiconductor thermistor materials. Unlike conventional resistive heaters that maintain a fixed resistance regardless of temperature, a PTC heater exploits the inherent self-regulating behaviour of its semiconductor element: as the element temperature rises beyond a critical threshold known as the Curie point (Tc), its electrical resistance increases sharply, which reduces current flow and consequently limits further heating. When the element cools below Tc, resistance drops again, restoring heat output. This closed-loop thermal behaviour — referred to as the PTC domino effect — means the heater naturally stabilises at a target surface temperature without requiring any external thermostat or control circuitry.
The YB80-240/150/021 model is rated at 3.7W when supplied at 220V AC, with a cold resistance in the range of 500Ω to 2kΩ measured at 25°C. The self-regulating surface temperature stabilises at 85±10°C under normal operating conditions. Electrical safety performance is assured by a minimum insulation resistance of 20MΩ at DC 500V and a dielectric withstanding voltage of AC 3750V for two minutes with a leakage current ceiling of 1mA, confirming suitability for mains-connected enclosure environments. The unit ships with pre-attached UL1332-rated 22AWG black power leads enclosed in plastic pipes, with a lead pull-out strength of 1.5kgf, ready for direct connection into the enclosure wiring.
The self-regulating characteristic of the YB series eliminates the overheating risk associated with fixed-resistance heaters in poorly ventilated enclosures or under partial-load conditions. Because the PTC element throttles its own power consumption as its temperature approaches the set point, the heater reaches a stable equilibrium without relying on secondary protection devices. This simplifies installation, reduces component count, and ensures a consistent low surface temperature that minimises the risk of contact burns and thermal stress on adjacent components. The compact form factor and pre-wired lead arrangement are suited to installation in space-constrained enclosures where mounting access is limited.
YB Series PTC Heaters Specifications
A practical overview for engineers and procurement teams evaluating resistive solutions.
Model: YB
Resistor type: Heater
Description: PTC
Power Rating: 3.7W, 220V
Resistance (Ω): 500~2k (@25C)
Tolerance (%): ±10
TCR (ppm/C): 1500
Applications of the YB Series PTC Heaters
Where RARA resistive heaters are deployed in the field.
Electrical switchgear and distribution boards — self-regulating anti-condensation heating without external thermostat control
Industrial control panels and PLC enclosures — maintaining minimum internal temperature in cold or damp environments
Outdoor and unheated equipment housings — preventing moisture ingress and corrosion on sensitive electronics and terminals
Motor control centres and variable-speed drives — enclosure warming during standby and overnight shutdown periods
Telecommunications and network infrastructure cabinets — humidity control in exposed plant rooms and kerbside cabinets
Instrumentation and metering enclosures — protecting precision measurement electronics from temperature-induced drift and condensation
Renewable energy and battery storage systems — cold-weather protection for inverter and battery management electronics
Railway and transportation control cubicles — reliable self-limiting heating under vibration and wide ambient temperature variation
Marine and offshore electrical panels — condensation and salt-air protection in high-humidity corrosive environments
Related Products of the YB Series PTC Heaters
Model: GBR-601
Resistor type: Heater
Description: Thick film elements
Power Rating: 10W~150W (heatsink)
Supply Voltage (V): 12-240
Tolerance (%): ±5
TCR (ppm/C): 50
Model: GBR-603
Resistor type: Heater
Description: Thick film elements
Power Rating: 5W~30W
Supply Voltage (V): 12-48
Tolerance (%): ±5
TCR (ppm/C): 1500
Model: GBR-605
Resistor type: Heater
Description: Thick film elements
Power Rating: 5W~60W (heatsink)
Supply Voltage (V): 12-240
Tolerance (%): ±5
TCR (ppm/C): 50
Model: GBR-612
Resistor type: Heater
Description: Thick film elements
Power Rating: 5W~100W
Supply Voltage (V): 12-240
Tolerance (%): ±5
TCR (ppm/C): 50
Why Choose RARA Resistive Heaters
What sets RARA apart for engineers and procurement managers in industrial and automotive markets.
01
Three Technologies
Metal clad space heaters, PTC self-regulating elements, and thick film heaters — RARA covers every industrial heating requirement from a single ISO-certified supplier.
02
Wide Voltage Range
From 3V DC low-voltage PCB warmers to 240V AC panel space heaters — the GBR series and RSHT/RSH range cover virtually any supply voltage in industrial or building systems.
03
PTC Self-Regulation
PTC models (YB, GBR-603) are inherently self-limiting — no thermostat or controller required. As temperature rises, power draw automatically decreases, preventing overheating by design.
04
Global Track Record
Deployed by Siemens, Schneider Electric, Rockwell, and Hanwha in industrial panels and power systems across six continents — backed by ISO 9001 and IATF 16949 certification.
