Allen Bradley
Allen-Bradley Thermistor AB 817-E1
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Specifications
| Brand | Allen-Bradley / Rockwell Automation |
|---|---|
| Model Number | 817-E1 |
| Official Product Name | Bulletin 817 Thermistor Protection Relay |
| Applicable System | Motor control circuits, transformer and bearing protection |
| Product Type | Thermistor / temperature monitoring relay |
| Equivalent Standard | N/A |
| Product Status | Active |
| Rated Thermal Current | 4 A |
| Contact Configuration | DPST (1 NO + 1 NC) |
| Max Number of Sensors | 6 PTC in series |
| Reset Type | Automatic (Type E1) |
| Trip Resistance | 3600 ohm (+/-300 ohm) |
| Operating Temperature | -25 to +60 deg C (RS), -40 to +80 deg C (PDF) |
| Dimensions | 98.8 x 22.5 x 89 mm |
| Weight | Approx. 0.13 kg |
| Supply Voltage | 24 to 240 V AC/DC |
Product Description
Allen-Bradley AB 817-E1 Thermistor. For Motor control circuits, transformer and bearing protection. Supplied with full traceability and documentation.
It provides a DPST (1 NO + 1 NC) output with automatic reset, operating from 24 to 240V AC/DC in a compact 22.5 mm DIN rail housing. The Allen-Bradley 817-E1 is a Bulletin 817 MachineAlert thermistor protection relay that monitors motor winding temperature via up to six PTC thermistors in series.
Basic Product Information
- Open- and short-circuit detection of sensor wiring
- DPST contact configuration (1 NO + 1 NC), 4 A rated thermal
- Wide 24 to 240V AC/DC supply range, no adjustments required
- Compact 22.5 mm DIN rail housing with status LED
- Monitors overtemperature via up to six PTC thermistors in series
Technical Specifications
Version & Model Difference
- The 817 family offers Type E1 (automatic reset) and Type E2 (status storage, manual/remote reset). The 817-E1 is the automatic-reset version; select E2 where fault latching is required.
Application Scenarios
- Motor winding overtemperature protection
- Transformer and bearing temperature monitoring
- VFD-controlled motor protection
- Compressor and heating-system safeguarding
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Frequently Asked Questions
What does the 817-E1 monitor?
It monitors motor winding (and similar) temperature using up to six PTC thermistors in series.
What supply voltage does it need?
It operates from 24 to 240V AC/DC with no adjustments required.
What is the contact rating?
It provides a DPST (1 NO + 1 NC) output rated 4 A thermal.
What reset type is the E1?
The 817-E1 is the automatic-reset version; the E2 variant adds manual/remote reset and fault storage.
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