1606-XL480E-3 | Allen-Bradley Switched Mode Power Supply
The 1606-XL480E-3 is a 3-phase DIN-rail mounted switched mode power supply from the Allen-Bradley Bulletin 1606-XL series. Operating on a 3-phase AC input voltage range of 380 to 480 VAC (or continuous 550 to 820 VDC input), it delivers a regulated 24 VDC output at up to 20 A continuous current with 480 W nominal power. Designed for industrial automation systems, it features an integrated fixed 47 ohm resistor inrush current limiter that eliminates warm-start reset delays and minimizes operating thermal losses.
Inrush Current Limiting and Thermal Management
The 1606-XL480E-3 incorporates a fixed 47 ohm resistor circuit rather than a conventional NTC thermistor to control startup transients. Once operational, the internal control circuit bridges the limiting resistor, reducing internal continuous power dissipation to approximately 42 W at nominal loading. Because peak inrush current is limited without thermal recovery dependencies (typically under 15 A at 440 VAC and under 17 A at 480 VAC), the power supply can be restarted immediately after shutdown without requiring off-line cooling intervals.
Convection-cooled across its standard mounting orientation, the module achieves typical electrical efficiency of 92% at full output load. It maintains full 480 W output up to 60 deg C ambient operating temperature, supporting short-term power boosts up to 600 W (24 V / 25 A) at temperatures up to 45 deg C.
Electrical Protection and Diagnostics
Three front-panel LED indicators provide real-time DC output voltage diagnostic feedback:
- Green LED: Continuous illumination indicates normal output voltage (Vout > threshold voltage UT).
- Red LED (Solid): Indicates low DC output voltage within 14 V < Vout < UT.
- Red LED (Flashing): Signals overload, output short-circuit condition, or output voltage below 14 V, triggering intermittent hiccup recovery mode.
The power supply supports secondary-side parallel connection of up to ten units for current sharing or redundant configuration. Output voltage is adjustable from 24 to 28 VDC via a front-panel potentiometer. Over-voltage protection automatically triggers hiccup mode when output voltage reaches 32 V ± 10%.
| Parameter | Specification |
|---|---|
| Model | 1606-XL480E-3 |
| Brand | Allen-Bradley |
| Product Type | Switched Mode Power Supplies |
| Series | Bulletin 1606-XL |
| Input Voltage (AC) | 3-Phase 380 to 480 VAC (Continuous range: 408 to 576 VAC) |
| Input Voltage (DC) | 550 to 820 VDC (Short-term range: 450 to 890 VDC) |
| Input Frequency | 47 to 63 Hz (Nominal 50 to 60 Hz) |
| Nominal Input Current | 3 x 1.5 A |
| Peak Inrush Current | < 15 A at 440 VAC / < 17 A at 480 VAC |
| Inrush Limiting Type | Fixed 47 Ohm resistor (bridged during operation) |
| Nominal Output Voltage | 24 VDC (Adjustable range: 24 to 28 VDC) |
| Nominal Output Power | 480 W (Continuous up to 60 deg C) |
| Rated Output Current | 20 A @ 24 VDC / 18 A @ 28 VDC (Tamb 0 to 60 deg C) |
| Boost Output Loading | 25 A @ 24 VDC (600 W) / 22 A @ 28 VDC (616 W) (Tamb 0 to 45 deg C) |
| Peak Efficiency | 92% typical @ 24 VDC / 20 A |
| Power Loss | 42 W typical @ 24 VDC / 20 A |
| Output Ripple & Noise | < 20 mVpp (20 MHz bandwidth, 50 Ohm measurement) |
| Hold-up Time | > 11 ms @ 24 VDC / 20 A |
| Over-Voltage Protection | Switches to hiccup mode at 32 V ± 10% |
| Operating Temperature | 0 to +70 deg C (Derating: 12 W/K above +60 deg C) |
| Storage Temperature | -25 to +85 deg C |
| Mounting Type | DIN-35 Rail |
| Enclosure Protection | IP20 |
| Wire Size Range | Stranded 0.5 to 4 mm² (20 to 10 AWG) / Solid 0.5 to 6 mm² (20 to 10 AWG) |
| Terminal Screw Torque | 0.8 N·m (7 lb·in) |
| Dimensions (W x H x D) | 220 x 124 x 102 mm |
| Weight | 1.8 kg (3.97 lbs) |
Installation Guidelines
Mount the unit vertically on a standard 35 mm DIN rail with input wiring connection blocks located on the lower panel section. To ensure adequate natural convection cooling, maintain a minimum clearance of 70 mm above and below the power supply housing and 25 mm clearance on the left and right sides.
Frequently Asked Questions
Q: Why does the 1606-XL480E-3 not require a thermal reset period after a warm restart?
A: Unlike power supplies using NTC thermistors, the 1606-XL480E-3 uses a fixed 47 ohm resistor for inrush current limiting. Because its limiting resistance does not rely on thermal cooling, the unit can limit peak inrush current immediately upon re-application of input voltage without cool-down delays.
Q: Can multiple 1606-XL480E-3 power supplies be connected in parallel to increase load capacity?
A: Yes, up to ten 1606-XL480E-3 units can be operated in parallel. Current sharing across units is facilitated by configuring the output voltage/current characteristic via an internal front-panel bridge connection.
1606-XL480E-3 | Allen-Bradley Switched Mode Power Supply
1606-XL480E-3 | Allen-Bradley Switched Mode Power Supply
The 1606-XL480E-3 is a 3-phase DIN-rail mounted switched mode power supply from the Allen-Bradley Bulletin 1606-XL series. Operating on a 3-phase AC input voltage range of 380 to 480 VAC (or continuous 550 to 820 VDC input), it delivers a regulated 24 VDC output at up to 20 A continuous current with 480 W nominal power. Designed for industrial automation systems, it features an integrated fixed 47 ohm resistor inrush current limiter that eliminates warm-start reset delays and minimizes operating thermal losses.
Inrush Current Limiting and Thermal Management
The 1606-XL480E-3 incorporates a fixed 47 ohm resistor circuit rather than a conventional NTC thermistor to control startup transients. Once operational, the internal control circuit bridges the limiting resistor, reducing internal continuous power dissipation to approximately 42 W at nominal loading. Because peak inrush current is limited without thermal recovery dependencies (typically under 15 A at 440 VAC and under 17 A at 480 VAC), the power supply can be restarted immediately after shutdown without requiring off-line cooling intervals.
Convection-cooled across its standard mounting orientation, the module achieves typical electrical efficiency of 92% at full output load. It maintains full 480 W output up to 60 deg C ambient operating temperature, supporting short-term power boosts up to 600 W (24 V / 25 A) at temperatures up to 45 deg C.
Electrical Protection and Diagnostics
Three front-panel LED indicators provide real-time DC output voltage diagnostic feedback:
- Green LED: Continuous illumination indicates normal output voltage (Vout > threshold voltage UT).
- Red LED (Solid): Indicates low DC output voltage within 14 V < Vout < UT.
- Red LED (Flashing): Signals overload, output short-circuit condition, or output voltage below 14 V, triggering intermittent hiccup recovery mode.
The power supply supports secondary-side parallel connection of up to ten units for current sharing or redundant configuration. Output voltage is adjustable from 24 to 28 VDC via a front-panel potentiometer. Over-voltage protection automatically triggers hiccup mode when output voltage reaches 32 V ± 10%.
| Parameter | Specification |
|---|---|
| Model | 1606-XL480E-3 |
| Brand | Allen-Bradley |
| Product Type | Switched Mode Power Supplies |
| Series | Bulletin 1606-XL |
| Input Voltage (AC) | 3-Phase 380 to 480 VAC (Continuous range: 408 to 576 VAC) |
| Input Voltage (DC) | 550 to 820 VDC (Short-term range: 450 to 890 VDC) |
| Input Frequency | 47 to 63 Hz (Nominal 50 to 60 Hz) |
| Nominal Input Current | 3 x 1.5 A |
| Peak Inrush Current | < 15 A at 440 VAC / < 17 A at 480 VAC |
| Inrush Limiting Type | Fixed 47 Ohm resistor (bridged during operation) |
| Nominal Output Voltage | 24 VDC (Adjustable range: 24 to 28 VDC) |
| Nominal Output Power | 480 W (Continuous up to 60 deg C) |
| Rated Output Current | 20 A @ 24 VDC / 18 A @ 28 VDC (Tamb 0 to 60 deg C) |
| Boost Output Loading | 25 A @ 24 VDC (600 W) / 22 A @ 28 VDC (616 W) (Tamb 0 to 45 deg C) |
| Peak Efficiency | 92% typical @ 24 VDC / 20 A |
| Power Loss | 42 W typical @ 24 VDC / 20 A |
| Output Ripple & Noise | < 20 mVpp (20 MHz bandwidth, 50 Ohm measurement) |
| Hold-up Time | > 11 ms @ 24 VDC / 20 A |
| Over-Voltage Protection | Switches to hiccup mode at 32 V ± 10% |
| Operating Temperature | 0 to +70 deg C (Derating: 12 W/K above +60 deg C) |
| Storage Temperature | -25 to +85 deg C |
| Mounting Type | DIN-35 Rail |
| Enclosure Protection | IP20 |
| Wire Size Range | Stranded 0.5 to 4 mm² (20 to 10 AWG) / Solid 0.5 to 6 mm² (20 to 10 AWG) |
| Terminal Screw Torque | 0.8 N·m (7 lb·in) |
| Dimensions (W x H x D) | 220 x 124 x 102 mm |
| Weight | 1.8 kg (3.97 lbs) |
Installation Guidelines
Mount the unit vertically on a standard 35 mm DIN rail with input wiring connection blocks located on the lower panel section. To ensure adequate natural convection cooling, maintain a minimum clearance of 70 mm above and below the power supply housing and 25 mm clearance on the left and right sides.
Frequently Asked Questions
Q: Why does the 1606-XL480E-3 not require a thermal reset period after a warm restart?
A: Unlike power supplies using NTC thermistors, the 1606-XL480E-3 uses a fixed 47 ohm resistor for inrush current limiting. Because its limiting resistance does not rely on thermal cooling, the unit can limit peak inrush current immediately upon re-application of input voltage without cool-down delays.
Q: Can multiple 1606-XL480E-3 power supplies be connected in parallel to increase load capacity?
A: Yes, up to ten 1606-XL480E-3 units can be operated in parallel. Current sharing across units is facilitated by configuring the output voltage/current characteristic via an internal front-panel bridge connection.
