EM-T50 is a wirewound power resistor designed for use as a braking resistor in DC motor-control applications. During motor deceleration, regenerated electrical energy can be directed to the resistor and converted into heat.
The resistor is available in two resistance values. The EM-T50-2R2-80W version has a resistance of 2.2 Ω and is recommended for 12–24 V systems. The EM-T50-4R7-80W version has a resistance of 4.7 Ω and is recommended for 24–48 V systems.
When a motor decelerates or is driven by its mechanical load, it can operate as a generator and return electrical energy to the motor controller’s DC supply. A braking resistor provides a controlled path for dissipating this regenerated energy.
The EM-T50 is intended for connection to a compatible motor controller or braking-load controller equipped with a braking-resistor output. The controller determines when the resistor is connected to the DC bus.
The 2.2 Ω version is recommended for 12–24 V systems. Its lower resistance provides greater braking current and braking power at a given voltage.
The 4.7 Ω version is recommended for 24–48 V systems. Its higher resistance limits braking current in higher-voltage applications.
The nominal power rating is 80 W. The resistor can also withstand a specified peak power of 500 W for up to 5 seconds, making it suitable for intermittent motor-braking applications.
The permissible repetition rate depends on the energy of each braking event, the mounting method, airflow, ambient temperature and the time available for cooling between braking cycles.
Braking-resistor current and instantaneous power can be estimated using the following equations:
I = U / R
P = U² / R
The selected resistor must remain within the minimum resistance, maximum current and energy limits specified for the connected motor controller or braking-load unit.
The resistor can become very hot during braking. It must be mounted on a suitable heat-resistant surface with adequate ventilation and sufficient clearance from wiring, plastic components and combustible materials.
Cable lugs are included with the resistor.
| Model | Resistance | Recommended system voltage |
|---|---|---|
| EM-T50-2R2-80W | 2.2 Ω | 12–24 V |
| EM-T50-4R7-80W | 4.7 Ω | 24–48 V |
| Resistor type | Wirewound power resistor |
|---|---|
| Resistance, EM-T50-2R2-80W | 2.2 Ω |
| Resistance, EM-T50-4R7-80W | 4.7 Ω |
| Nominal power rating | 80 W |
| Peak power | 500 W for 5 s |
| Calculated energy at specified peak rating | 2.5 kJ per 5-second pulse |
| Included accessories | Cable lugs |
| Weight | 165 g |
Ordering larger quantities +100pcs.
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