LTi Drives BR-090.03.540.UR.H38 Brake Resistor
Product Overview
The LTi Drives BR-090.03.540.UR.H38 is an industrial braking resistor identified by its complete model designation. The supplied product information lists a rated power of 300 W, a resistance of 90 ohms and a voltage rating of 750 V. These values provide essential starting points for identifying the component and evaluating its suitability for a compatible drive system. Final selection must follow the applicable manufacturer documentation and the electrical requirements of the installation.
Braking resistors are used with compatible variable frequency drives and servo drive systems to dissipate electrical energy generated during controlled deceleration. When a motor operates as a generator during braking, energy can return to the drive's DC link. In systems designed for external resistive braking, the braking circuit directs this energy into a resistor, where it is converted into heat.
Resistance and Power Rating
The listed 90 ohm resistance is a key electrical parameter. The braking resistor must have a resistance within the range permitted by the connected drive. Using a value that is too low can cause excessive braking current and may damage the drive's braking circuit. A resistance that is too high may limit the available braking performance.
The 300 W rating describes the stated power classification, but it should not automatically be interpreted as the permissible power under every operating condition. Peak braking power, duty cycle, pulse duration, ambient temperature and cooling conditions can all affect the actual usable performance.
Industrial Drive Applications
Braking resistors are commonly incorporated into compatible motion control and variable speed systems where deceleration must be controlled. Potential applications include material handling equipment, automated machinery, positioning systems and production processes involving frequent changes in motor speed.
The BR-090.03.540.UR.H38 should only be connected to a drive whose braking circuit supports the resistor's verified electrical characteristics. The 750 V marking must be interpreted according to the manufacturer's specification and must not be treated as proof of compatibility with every 750 V DC bus.
Installation and Safety
Braking resistors can become extremely hot during operation. Installation must follow the specified mounting clearances, ventilation requirements, thermal protection arrangements and cable recommendations. Keep combustible materials away from hot surfaces and ensure that the resistor is mounted in an environment appropriate for its temperature characteristics.
Before installation or maintenance, isolate the drive and follow the manufacturer's discharge procedure for the DC link. Stored electrical energy may remain after the main supply has been disconnected. Electrical work must be carried out by qualified personnel using the correct safety procedures.
Maintenance and Selection
Inspect the resistor body, electrical terminals, wiring and mounting hardware for visible damage, loose connections or signs of overheating. Check any associated thermal protection and confirm that the drive's braking parameters match the resistor specification.
The LTi Drives BR-090.03.540.UR.H38 is identified by its 300 W, 90 ohm and 750 V markings. Confirming these parameters against the actual drive requirements helps support safe braking operation and reliable industrial equipment performance.
