Diesel generator set 4B3.9

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Overview
Compact industrial diesel generator set based on the 4B3.9 engine platform. Designed for commercial and industrial applications, it delivers rated, standby and continuous power options with 50 Hz and 60 Hz configurations. Core components include a Cummins® engine, selectable alternator options and PowerCommand® electronic control.

Key features

• Cummins® 4-cycle diesel engine for industrial use
• Alternators in multiple sizes with 2/3-pitch low-reactance windings, low waveform distortion under non-linear loads and short-circuit capability
• PowerCommand® electronic control with remote start/stop, precise voltage and frequency regulation, alarm and status display, AmpSentry™ protection and automatic shutdown on fault detection
• Integrated radiator cooling system sized for rated ambient conditions
• Optional weatherproof and sound-attenuating enclosures
• Optional sub-base double-wall fuel tanks and day tanks on skid

Technical data

• Model: 4B3.9
• Frequencies: 50 Hz and 60 Hz
• Maximum power range: 31–38 kW (38–48 kVA)
• Standby power range: 34–42 kW (42–53 kVA)
• Continuous power: 23 kW (29 kVA) for selected configurations
• Fuel: Diesel
• Control: PowerCommand® electronic GenSet controller
• Certification: EPA Tier 1 (selected configurations)

Selected models

• C45 D5 — 50 Hz — Prime 31 kW / 38 kVA — Standby 34 kW / 42 kVA — EPA Tier 1
• C40 D6 — 60 Hz — Prime 38 kW / 48 kVA — Standby 42 kW / 53 kVA
• C40 D6 (alt config) — 60 Hz — Prime 36 kW / 45 kVA — Standby 40 kW / 50 kVA (example with 4BT3.3-G5 engine)
• C40 D6 / C40 D6-0 — 60 Hz — Continuous 23 kW / 29 kVA (selected configurations)

Applications
Commercial and industrial power supply: primary power, standby backup, remote-site power and microgrids as configured.

Compliance & availability
Designed for NFPA 110 Level 1 one-step full-rated load acceptance. Product availability: Africa & Middle East, Asia & Pacific, Europe, India, Latin America, North America. Warranty information available from the manufacturer.