Sew Eurodrive RM167‑DRN315S4 DFT71D4 Helical Gear Drive
This Sew Eurodrive helical gear drive combines DFT71D4 and RM167‑DRN315S4 for reliable heavy‑duty power transmission in industrial applications. Built with precision‑cut helical gears, it delivers smooth, low‑noise operation, high torque output and excellent shock‑load resistance. Compact and robust construction ensures stable long‑term performance under continuous working conditions. Suited for conveyors, mixers and general processing machinery, this integrated gear‑motor unit features solid build quality, easy installation and low maintenance requirements to meet demanding industrial drive needs.
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Estimated Delivery Date: Sep 05-Sep 05
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Specifications
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SEW helical gear motors are well‑suited for applications involving high‑inertia start‑up, frequent switching and braking cycles, and operating conditions with fluctuating mains power supply. Besides TF thermal sensors, a motor circuit breaker is generally fitted as supplementary protection. For inverter‑driven operation, SEW‑EURODRIVE strongly advises selecting motors factory‑fitted with TF sensors.
TH Thermostat
Three series‑connected bimetallic TH switches are integrated inside the motor, hard‑wired directly to the motor monitoring circuit via the terminal box.
Trigger Temperature
Thermal protection for the motor is delivered by built‑in TF temperature sensors or TH bimetallic switches embedded within the motor’s end windings. Their trigger temperature is set marginally below the thermal class limit, delivering optimal motor overheat protection.
TF temperature sensors and TH bimetallic switches are offered with the trigger temperatures listed below
| Thermal Class | Trigger Temperature(Rated response temperature‑TF) | (Rated switching temperature‑TH) |
|---|---|---|
| 155 (F) | 150 °C | 150 °C |
| 180 (H) | 170 °C | 170 °C |
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SEW helical gear drives perform reliably under demanding working scenarios: high‑inertia start‑ups, repeated switching & braking operations, and unstable fluctuating mains power conditions. To secure full motor protection, a motor circuit breaker is normally deployed alongside TF thermal sensors. SEW‑EURODRIVE highly recommends TF‑equipped motors for all inverter‑powered running.
The TH thermostat consists of three bimetallic switches wired in series inside the motor, directly routed to the motor monitoring circuit through the terminal box.
Both TF temperature sensors and TH bimetallic switches are embedded into motor end windings to provide thermal overload protection. Trigger thresholds are calibrated slightly under the motor thermal class rating, maximizing winding safety.
Available trigger temperatures for TF sensors and TH bimetallic switches:
- Thermal Class 155 (F): 150 °C (TF rated response / TH rated switching temperature)
- Thermal Class 180 (H): 170 °C (TF rated response / TH rated switching temperature)
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