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Microelettrica Scientifica PTC1177

Product Brief: Ceramic PTC (Positive Temperature Coefficient thermistor) start relay used to momentarily engage the start winding of single-phase capacitor-start or split-phase compressor motors. When energized, the PTC heats up and becomes high-resistance, effectively removing the start winding from circuit after run-up.

Category: Others

Description

Key Technical Specifications:

Device Type: PTC Start Relay (Semiconductor ceramic pellet type)
Typical Use: Refrigeration / air-conditioning hermetic compressors (e.g. Tecumseh, Embraco, Danfoss small frames)
Rated Voltage: 110–250 VAC (line voltage applied across PTC during start cycle)
Switch-off Resistance (Hot): >10–30 kΩ (typical for start-relay PTC — blocks current after heating)
Cold (Room Temp) Resistance: 15–50 Ω (allows start winding current to flow at switch-on)
Trip / Switch Time: 0.1–0.5 s (depends on motor inrush & PTC characteristics)
Max Switching Current: Typically 15–30 A inrush (verify per compressor HP)
Insulation Resistance: ≥100 MΩ @ 100 VDC
Dielectric Strength: 1500–2000 VAC (terminal to case, 1 min)
Operating Temp Range: -30°C to +85°C (ambient); PTC pellet reaches 120–150°C internally during operation
Terminals: Quick-connect spade terminals (typically 1/4″ or 3/16″)
Mounting: Clip-on or socket mount onto compressor terminal box

Features & Working Principle: Uses barium titanate ceramic PTC whose resistance rises sharply above Curie temperature. On compressor start, cool PTC conducts → start winding energized. After ~100–300 ms, self-heating raises PTC above Curie point → high resistance → start winding effectively disconnected. No mechanical contacts = silent operation & long life.

Applications: Domestic / commercial refrigerator compressors, freezer compressors, small air-conditioner condensing units, vending machine refrigeration.

Installation & Notes: Must be matched to compressor HP & start winding impedance — incorrect PTC causes failure to start or overheating. Ensure good thermal contact is NOT required (PTC self-heats). Allow cool-down time (~3 min) before re-start to permit PTC to return to low-resistance state. Replace together with start capacitor if applicable.

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