Contact Info

M3575R-H8BF

Home / Product/ RELIANCE
M3575R-H8BF
June 08, 2026

M3575R-H8BF

The M3575R-H8BF is a high‑power, enclosed resistive braking load module manufactured by Bonitron (also branded Reliance/Baldor), designed for 460–480 VAC AC drive systems to dissipate regenerative energy and suppress DC bus overvoltage during motor deceleration or overhauling loads. As a passive braking resistor unit, it works with an external braking chopper (such as the M3575T series) and is widely used in industrial motion control and power conversion applications.

Description

M3575R-H8BF

The M3575R-H8BF is a high‑power, enclosed resistive braking load module manufactured by Bonitron (also branded Reliance/Baldor), designed for 460–480 VAC AC drive systems to dissipate regenerative energy and suppress DC bus overvoltage during motor deceleration or overhauling loadsBonitron. As a passive braking resistor unit, it works with an external braking chopper (such as the M3575T series) and is widely used in industrial motion control and power conversion applications.

General Description

The M3575R‑H8BF belongs to Bonitron’s M3575R series of resistive braking loads, which provide robust, compact, and cost‑effective energy dissipation for variable frequency drives with fixed DC buses. The part number breaks down as: “M3575R” = resistive load module; “H” = 460–480 VAC rating; “8” = 8 HP drive capacity; “B” = B‑style chassis; “F” = convection cooling (no internal fan). Built with a non‑inductive wirewound resistor element and a heavy‑gauge steel enclosure, the unit delivers stable, low‑inductance braking performance under high peak power and cyclic loads.

Key Electrical Specifications

  • Nominal AC Voltage: 460–480 VAC (640 VDC typical DC bus)

  • Resistance: 90 Ω ± toleranceBonitron

  • Peak Braking Power: 5968 WBonitron

  • Continuous Braking Power: 1200 WBonitron

  • Rated Drive HP: 8 HP (150% capacity: 5 HP)Bonitron

  • Duty Cycle: 20% maximum (convection cooled)Bonitron

  • Braking Current: 1.0 A continuous, 15 A peak

  • Over‑Temperature Protection: 125 VAC, 15A resistive output (normally closed, opens at over‑temp)

Mechanical and Environmental Characteristics

  • Enclosure: Heavy‑gauge steel, NEMA 1 rated, blue protective finishBonitron

  • Dimensions: 17.75” H × 4.00” W × 9.50” D (approx. 451 mm × 102 mm × 241 mm)Bonitron

  • Weight: 14.0 lbs (6.35 kg)Bonitron

  • Mounting: Wall or floor‑mountable; vertical installation recommended for natural convection airflow

  • Cooling: Convection (no internal fan); ribbed chassis for enhanced heat dissipation

  • Operating Temperature: 0 °C to +40 °C (ambient)

  • Storage Temperature: −20 °C to +65 °C

  • Terminals: Heavy‑duty screw terminals for high‑current power wiring; control terminals for over‑temp signal

  • Certifications: RoHS compliant; assembled in the USABonitron

Performance and Reliability

The M3575R‑H8BF uses a non‑inductive wirewound resistor design to minimize voltage spikes and ensure stable braking during fast deceleration and high‑frequency cycling. The enclosed construction protects against dust, moisture, and industrial contaminants, while the over‑temperature switch provides fail‑safe protection against overload or blocked airflow. With no moving parts, the unit offers long service life and low maintenance in heavy‑duty environments, including repetitive start‑stop and overhauling load conditions.

Typical Applications

  • Dynamic Braking for AC Drives: 460–480 VAC, 8 HP and below applications such as conveyors, cranes, hoists, machine tools, and centrifugesBonitron

  • Overhauling Loads: Elevators, escalators, downhill conveyors, and winches where the motor operates as a generator

  • DC Bus Overvoltage Protection: Prevents drive tripping or damage from regenerative energy feedback in PWM drive systems

  • Industrial Motion Control: Material handling, packaging machinery, and process equipment with frequent deceleration cycles

  • Retrofit and Replacement: Direct replacement for older Bonitron, Reliance, or Baldor braking resistors in existing drive systems

Ordering and Compatibility Information

  • Part Number: M3575R‑H8BF (also referenced as M3575RH8BF)

  • Manufacturer: Bonitron (Reliance Electric / Baldor Electric)

  • Compatibility: Works with most 460–480 VAC PWM drives and external braking chopper modules (e.g., Bonitron M3575T series)

  • Status: Active production; available new, surplus, or refurbished

  • Warranty: Standard 1‑year manufacturer’s warranty


Get a Quote

Search

Categories

pages