SEW Spare Parts BG1.5 8253846 Motor Brake Rectifier 100–500 V AC Power Into 240 V DC

SEW BG1.5 8253846 Motor Brake Rectifier

1. Overview of the SEW BG1.5 8253846

The SEW BG1.5 8253846 is an "energy gatekeeper" about half the size of a palm. It reliably rectifies 100–500 V AC power into 240 V DC. Its continuous output of 1.5 A allows the SEW brake to release in milliseconds and lock securely in the event of a power outage, eliminating the need for inertia to stop the motor. Half-wave rectification and an integrated varistor suppress power spikes and reduce power consumption. Its -25°C to +70°C wide operating temperature range ensures rock-solid stability in cold storage, ports, and textile workshops.

2. Core Features:

• Function: Half-wave brake rectifier, used to convert AC to DC to power SEW DC disc brakes
• Input voltage: AC 150–500 V, 50/60 Hz
• Output voltage: DC 0.45 × UAC (typically 230 VAC → ≈103 VDC)
• Rated output current: 1.5 A (continuous)
• Applicable motor frames: Series 63–100 (DT/DV 71–100)
• Mounting: Directly into the motor terminal box, with 6.3 mm Faston terminals
• Degree of protection: IP20 (inside the terminal box)
• Ambient temperature: -25…+70°C
• Approvals: CE, UL, cUL

Half-wave rectification: Converts single-phase AC into pulsating DC, providing reliable excitation power for the brake coil.
Quick brake release: Instantaneous demagnetization occurs by disconnecting the AC side, with a brake release time of less than 40 ms, meeting high-frequency start-stop conditions.
Integrated varistor: Suppresses coil turn-off overvoltage, preventing contact erosion and extending brake life.
Universally compatible: Directly compatible with SEW BMG05, BMG1, and BMG2 brakes, requiring no additional adjustments.

3. Product details pictures

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