USD 642.86
24 VDC, 20 A DIN-rail PSU with PowerBoost/TopBoost, DC OK relay, 91% efficiency, IP20, parallel/series operation.
WAGO 787-834 is a single-phase switched-mode DIN-rail power supply from the Pro series with 24 VDC SELV output and 20 A nominal output current. The unit accepts 1 x 100…240 VAC input, with a wider operating range of 1 x 85…264 VAC or 120…300 VDC, and provides 480 W nominal output power. It includes PowerBoost and TopBoost overload capabilities, DC OK relay signaling, standby input, and supports both parallel and series operation. The datasheet shows encapsulated construction for control cabinet use, natural convection cooling when horizontally mounted, IP20 protection, and isolation voltages up to 4.242 kVDC primary-secondary.
| Parameter | Value |
|---|---|
| Item Number | 787-834 |
| Input phases | 1 |
| Nominal input voltage | 1 x 100 … 240 VAC |
| Input voltage range | 1 x 85 … 264 VAC; 120 … 300 VDC |
| Nominal mains frequency range | 50 … 60 Hz; 0 Hz |
| Input current | ≤ 2.3 A (230 VAC; 20 ADC) |
| Inrush current | ≤ 8 A (active power factor correction) |
| Power factor correction | Active |
| Mains failure hold-up time | ≥ 25 ms (230 VAC) |
| Nominal output voltage | 24 VDC (SELV) |
| Output voltage range | 22 … 29.5 VDC (adjustable) |
| Default setting | 24 VDC |
| Nominal output current | 20 A (24 VDC) |
| Nominal output power | 480 W |
| Deviation | ≤ 1 % |
| Residual ripple | ≤ 70 mV (peak-to-peak) |
| Current limitation | 1.1 x I o nom (typ.) |
| Overload behavior | TopBoost/PowerBoost/Constant current mode |
| PowerBoost | 30 ADC (4 s); 25 ADC (8 s) |
| TopBoost | 80 ADC (25 ms) |
| Signaling | 1 x DC OK LED (green); 1 x Error LED (red); 1 x Stand-by input; 1 x DC OK relay contact (changeover contact) |
| Efficiency (typ.) | 91 % |
| Internal fuse | T 10 A / 250 VAC |
| Isolation voltage (pri.-sec.) | 4.242 kVDC |
| Isolation voltage (pri.-PE) | 2.2 kVDC |
| Isolation voltage (sec.-PE) | 0.7 kVDC |
| Protection class | I |
| Protection type | IP20; per EN 60529 |
| Resistance to reverse feed | ≤ 35 VDC |
| Overvoltage category | II |
| Pollution degree | 2 |
| Transient suppression (primary) | Varistor |
| Short-circuit-protected | Yes |
| Open-circuit-proof | Yes |
| Parallel operation | Yes |
| Series operation | Yes |
| MTBF | > 500,000 h (per IEC 61709) |
| Connection technology (input) | CAGE CLAMP® |
| WAGO connector (input) | WAGO 231 Series |
| Input solid conductor | 0.08 … 2.5 mm² / 28 … 12 AWG |
| Input fine-stranded conductor | 0.08 … 2.5 mm² / 28 … 12 AWG |
| Input strip length | 8 … 9 mm / 0.31 … 0.35 inches |
| Connection technology (output) | Push-in CAGE CLAMP® |
| WAGO connector (output) | WAGO 831 Series |
| Output solid conductor | 0.5 … 10 mm² / 20 … 8 AWG |
| Output fine-stranded conductor | 0.5 … 10 mm² / 20 … 8 AWG |
| Output strip length | 13 … 15 mm / 0.51 … 0.59 inches |
| Connection technology (signaling) | CAGE CLAMP® |
| WAGO connector (signaling) | WAGO 733 Series |
| Signaling solid conductor | 0.08 … 0.5 mm² / 28 … 20 AWG |
| Signaling fine-stranded conductor | 0.08 … 0.5 mm² / 28 … 20 AWG |
| Signaling strip length | 5 … 6 mm / 0.2 … 0.24 inches |
| Mounting type | DIN-35 rail |
| Width | 97 mm |
| Height | 171 mm |
| Depth from upper-edge of DIN-rail | 187 mm |
| Weight | 2300 g |
| Ambient temperature (operation) | -25 … +70 °C (Device starts at -40 °C type-tested) |
| Ambient temperature (storage) | -25 … +85 °C |
| Relative humidity | 5 … 96 % (no condensation permissible) |
| Derating | -3 %/K (> 50 °C) |
| Climatic category | 3K3 (per EN 60721) |
| Conformity marking | CE |
| Standards/specifications | EN 61010-1; EN 61010-2-201; EN 61204-3; EN 61558-2-16; UL 60950; UL 508 |
| Country of origin | DE |
| Packaging type | Box |
Provides regulated 24 VDC SELV supply for PLCs, remote I/O, relays, and control electronics in industrial panels.
Maintains stable low-voltage control power with low ripple, high hold-up time, and DC OK supervision.
Supports brief startup surges from solenoids, contactors, and motorized peripherals using PowerBoost and TopBoost reserve modes.
Prevents nuisance trips during transient high current demand while preserving normal operating efficiency.
Enables parallel and series operation for scalable or redundant 24 VDC power architectures in machine and process automation.
Allows load sharing, redundancy planning, and extended voltage distribution with monitored output status.
