817S-PTC-48
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Overview of Allen-Bradley 817S-PTC-48
The Allen-Bradley 817S-PTC-48 is a thermistor monitoring relay designed to protect equipment from over-temperature conditions. It is part of the Bulletin 817S series and provides supplementary motor protection functions that can be easily integrated into motor control circuits. The relay operates at 24 to 48 V AC/DC supply voltage and is used for monitoring PTC thermistor inputs.
Key Features of Allen-Bradley 817S-PTC-48
- Input Voltage: 24-48 V AC/DC
- Type: Thermistor monitoring relay
- Protection: Over-temperature detection
- Output Contacts: One Form C (SPDT) contact
- Automatic Reset: Yes
- Status Indicator: LED for operational status
- Delay Settings: Power ON delay options of 1 or 6 seconds
- Enclosure Rating: IP20, suitable for panel mounting
- Dimensions: 22.5 x 80 x 99.5 mm
- Compliance: cULus Listed, conforms to safety standards
Technical Specifications of 817S-PTC-48
| Supply Voltage | 24-48 V AC/DC ±15% |
| Output Contact | (1) Form C (SPDT) |
| Rated Insulation Voltage | 250 V AC |
| Power ON Delay | 1s ±0.5s or 6s ±0.5s |
| Operating Temperature Range | Standard industrial |
| Environmental Rating | IP20 |
| Dimensions (W x H x D) | 22.5 x 80 x 99.5 mm |
| Mounting Type | Panel mount |
Applications / Use Case
The 817S-PTC-48 relay is widely used in motor control circuits to monitor temperature via PTC thermistors and protect motors from overheating. Typical applications include blowers, compressors, conveyors, fans, mixers, pumps, and VFD-controlled motors. The relay offers reliable protection by triggering alarms or equipment shutdown under over-temperature conditions.
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