Product Description

Model Number Interpretation

• 2: Standard industrial accessory series

• SR: Snubber Resistor (braking/absorption unit)

• 4: 460 VAC (600 VDC) voltage class

• 0400: 400 W continuous power rating

Technical Specifications

• Rated Power: 400 W (continuous); 4,000 W (peak/instantaneous)

• AC Voltage Class: 460 VAC (±10%), 3‑phase, 50/60 Hz

• DC Bus Voltage: 600 VDC (max)

• Resistance: ~30 Ω (typical)

• Duty Cycle: 20–50% (depending on drive HP)

• Enclosure: NEMA 1 (indoor, ventilated steel)

• Cooling: Passive (no fan)

• Dimensions (H×W×D): ~462 × 210 × 216 mm (18.2 × 8.25 × 8.5 in)

• Weight: ~9–10 kg (20–22 lbs)

• Certifications: UL 508, CE (legacy)

• Cross Part: Allen‑Bradley R2SR40400, Baldor 2SR40400

Interface & Indicators

• Power Terminals: DC+ / DC− (connect to drive DC bus)

• Status LEDs:

  • DC Bus Lamp: ON when >50 VDC present

  • Braking Active Lamp: ON during energy dissipation

• Fault Contact: Dry contact for remote alarm signaling

Core Functions

• Regenerative Energy Dissipation: Converts excess motor energy to heat during braking

• Voltage Spike Suppression: Protects IGBTs from overvoltage (OV) faults

• Compact Passive Cooling: 400 W continuous without a fan

• LED Status Monitoring: Local visual indication of DC bus and braking activity

• Legacy Compatibility: Direct drop‑in for Reliance GP‑2000 460 VAC systems

Application Scenarios

• Reliance GP‑2000 Drives: 460 VAC, 1–5 HP systems

• General Industrial: Conveyors, pumps, fans with frequent start/stop

• Legacy Automation: Replacement for failed 2SR40400 in 460 VAC drive panels

Usage & Maintenance

• Installation: Mount vertically; allow 100 mm clearance for airflow

• Wiring: Use 14 AWG (2.5 mm²) stranded copper; torque terminals to 1.2 N·m

• Power‑Up: Verify DC bus voltage ≤600 VDC before connecting

• Maintenance: Quarterly—inspect terminals, clean dust, check LED operation

• Safety: Disconnect all power; wait 5 minutes for capacitors to discharge