People Electric · Thermal Overload Relay
Product overview
Original People Electric JRS8 thermal overload relays protect AC motors against sustained overload and phase loss. The setting range must contain the motor rated current and match the relay frame. Use with the correctly matched switching device and separately coordinated short-circuit protection.
Technical selection summary
| Manufacturer / series | Original People Electric JRS8 |
|---|---|
| Product function | Thermal motor overload and phase-loss protection; use a separately coordinated short-circuit protective device |
| Main-circuit operating voltage | AC 660V |
| Main-circuit frequency | 50/60Hz |
| Trip class | Class 10A: JRS8-16, -25, -45. Class 10: -85, -105, -170, -250, -370. |
| Auxiliary circuit | Frame-dependent auxiliary contact arrangements and ratings; refer to original table 4 and confirm the required NC trip and NO indication circuits. |
| Setting selection | Choose a frame first, then one documented adjustment interval for that frame. Set the relay to the actual motor/load current. |
| Control supply | Thermal bimetal relay; no independent contactor-coil voltage option is specified on this page. Auxiliary-circuit voltage ratings are contact-switching ratings. |
| Protection coordination | This relay is not a short-circuit circuit breaker. Fuse/SCPD references and conductor recommendations are in the complete catalogue. |
| Ambient / altitude | -5 to +40°C, daily average ≤35°C; altitude ≤2,000m |
| Installation environment | Pollution degree 3; installation category III; normal mounting within ±5° without excessive impact or vibration |
| Standards stated | GB 14048.4; IEC 60947-4-1 |
| JRS8-16 adjustment intervals | 0.11–0.16A, 0.14–0.21A, 0.19–0.29A, 0.27–0.4A, 0.35–0.52A, 0.42–0.63A, 0.55–0.83A, 0.7–1A, 0.9–1.3A, 1.1–1.5A, 1.3–1.8A, 1.5–2.1A, 1.7–2.4A, 2.1–3A, 2.7–4A, 3.4–4.5A, 4–6A, 5.2–7.5A, 6.3–9A, 7.5–11A, 9–13A, 12–17.6A |
| JRS8-25 adjustment intervals | 0.1–0.16A, 0.16–0.25A, 0.25–0.4A, 0.4–0.63A, 0.63–1A, 1–1.4A, 1.3–1.8A, 1.7–2.4A, 2.2–3.1A, 2.8–4A, 3.5–5A, 4.5–6.5A, 6–8.5A, 7.5–11A, 10–14A, 13–19A, 18–25A, 24–32A |
| JRS8-45 adjustment intervals | 0.28–0.4A, 0.35–0.52A, 0.45–0.63A, 0.55–0.83A, 0.7–1A, 0.86–1.3A, 1.1–1.6A, 1.4–2.1A, 1.8–2.5A, 2.2–3.3A, 2.8–4A, 3.5–5.2A, 4.5–6.3A, 5.5–8.3A, 7–10A, 8.6–13A, 11–16A, 14–21A, 18–27A, 25–35A, 30–45A |
| JRS8-85 adjustment intervals | 6–10A, 8–14A, 12–20A, 17–29A, 25–40A, 35–55A, 45–70A, 60–110A |
| JRS8-105 adjustment intervals | 27–42A, 36–52A, 45–63A, 57–82A, 70–105A, 80–115A |
| JRS8-170 adjustment intervals | 90–130A, 110–160A, 140–200A |
| JRS8-250 adjustment intervals | 100–160A, 160–250A, 250–400A |
| JRS8-370 adjustment intervals | 100–160A, 160–250A, 250–400A, 310–500A |
| Installation codes | Z = combined installation; F = separate installation |
Frame codes are catalogue frame designations, not limits to substitute for the documented setting intervals. Some printed ranges extend beyond the frame-code number. Z is combined installation; F is separate installation. Confirm exact contactor fit and auxiliary-contact requirements; do not assume every frame has identical contacts. Product photographs are original series illustrations and can show other frames or installation versions.
Typical applications
- Thermal overload and phase-loss protection of AC motor circuits.
- Motor-starter control circuits using the correctly matched contactor and coordinated short-circuit protection.
Specify your enquiry
For a focused quotation, include:
- Relay frame and current setting range; motor current, power and actual main-circuit voltage.
- Required installation version, matching contactor, reset mode and auxiliary-contact requirements.
- Quantity, destination and required drawings or compliance documents.
Download People Electric JRS8 catalogue (PDF)
Product reference images and drawings
