Weidmüller 8739140000 Switching Power Supply

Full Model Name: CP SNT 48W 24V 2A

Categoria: DIN Rail Single-Phase Switching Power Supply (ConnectPower INSTA Series)

1. Core Electrical Specifications

Ingresso

AC: 85～264 VAC, 50/60 Hz

Compatibilità CC: 110～370 VDC

Connessione: Morsetti a vite

Built-in 2.5A(T) input fuse

Produzione

Valutato: 24 VCC / 2 UN, total power 48 W

Adjustable output voltage range: 15～28 VDC

Ripple & rumore: ≤120 mV

Maximum parallel units: 3 (active current sharing)

Maximum capacitive load at output: 8000 µF

2. Isolamento & Protezione

Input-to-output isolation voltage: 4 kV

Funzioni di protezione: Sovracorrente, sovraccarico, cortocircuito, overvoltage automatic protection, auto-recovery after fault elimination

Status indicator: Green LED for power normal indication

3. Meccanico & Dati ambientali

Montaggio: Standard 35 Guida DIN da mm

Dimensioni complessive: W70 × H90.5 × D62.5 mm

Peso: ca. 200 G

Temperatura operativa: -10 ℃～+70 ℃ (derating required above 55℃)

Temperatura di conservazione: -40 ℃～+85 ℃

Umidità: ≤95%UR, senza condensa

4. Certificazioni & Conformità

CE, UL/cULus, TÜV, RoHS, PORTATA

Applicable standard: ITE industrial control equipment

5. Applicazioni tipiche

Power supply for PLCs, sensori, elettrovalvole, small control cabinets, automazione degli edifici, access control systems and fieldbus modules

6. Alternative Selection Reference (Stessa serie / Compatible Solutions)
7. Upgraded Weidmüller model with identical power rating: CP E SNT 48W 24V (new-generation economical version)
8. Third-party equivalent models:

Siemens SITOP PSU100C 24V/2.5A

Phoenix Contact STEP-PS 24V/2A

Application Scenarios of Weidmüller 8739140000 (CP SNT 48W 24V 2A)

This power supply belongs to the INSTA installation-grade DIN rail switching power supply. Rated 48W/24VDC/2A with wide-range input and compact plastic housing. It is mainly deployed in small and medium-sized control cabinets, building equipment and light-duty automation sites, suitable for 24VDC loads with total power consumption ≤42W (derating margin recommended).

1. Automazione industriale (Mainstream Application)

List of Powered Loads

Small PLCs, remote I/O modules, signal relay assemblies, proximity/photoelectric sensors, encoders, miniature solenoid valves, HMI (small touch panels), fieldbus terminal modules (Profinet/Modbus slaves).

Typical Equipment Scenarios

1. Substation control cabinets on production lines, small conveyor control boxes
2. Auxiliary control cabinets for packaging machinery, labellers and small test tooling
3. Auxiliary machine tool control cabinets (ventole di raffreddamento, sensor loops, signal circuits)
4. Test equipment, automated test benches and laboratory industrial control cabinets

> Nota: Not applicable for high-power servos or dense pneumatic valve clusters; minimum 15% power margin is recommended for all loads.

2. Automazione degli edifici / HVAC
3. Central air-conditioning DDC controllers, duct sensors, air damper actuators
4. Fire linkage control modules, smoke/temperature sensor repeaters, fire shutter control boxes
5. Intelligent lighting control modules, building gateways, energy consumption acquisition terminals
6. Local small control boxes for water pumps and fans
7. Access Control, Sicurezza & Intelligent Transportation
8. Access controllers, card readers, electric locks and small barrier control boxes
9. Security alarm hosts, perimeter infrared photoelectric beams and vibration detector power supply
10. Auxiliary control units for parking barriers, parking space detection sensors
11. Auxiliary signal collection boxes for traffic lights, miniature road detection terminals
12. Intelligent Equipment & Movimentazione dei materiali
13. AGV station call panels, photoelectric detection loops for sorting machines
14. Miniature signal acquisition cabinets in automated warehouses
15. Signal collection sub-stations for printing and textile machinery
16. Small control cabinets for food machinery (dry and clean working conditions)
17. Industrial LED Lighting & Signage

Equipment status indicators, cabinet internal lighting, equipment warning light strips

Small equipment display panels, workstation indicator light boxes (constant-voltage 24V light strips)

✅ Application Restrictions (Scenari non consigliati)

1. Open-air outdoor environments: No ingress protection rating; only for indoor cabinet installation
2. Cabinets with heavy dust, corrosive atmosphere or persistent condensation
3. Battery float charging applications (not a dedicated charging power supply; cannot directly charge batteries)
4. Continuous full-load operation close to 48W, or loads with frequent high impulse power
5. Long-term full-load operation inside enclosed cabinets above 55℃ (power derating mandatory)

Load Selection Guidelines

Safe continuous total power consumption: ≤42W (≈1.75A). Short-time peak loads can reach 48W temporarily, while continuous full load accelerates service life degradation.

Supporta fino a 3 units in parallel for capacity expansion (fine-tune output voltage to maintain current sharing when paralleling).

Mounting Specification for Weidmüller 8739140000 (CP SNT 48W 24V 2A)

1. Basic Mounting Method

Snap-on mounting onto standard 35 Guida DIN da mm (TH35-7.5)

1. Hook the upper latch on the bottom of the power supply onto the DIN rail;
2. Press down the housing until an audible click confirms the lower lock engages with the rail;
3. Removal: Use a flathead screwdriver to pry down the bottom latch, then lift upwards to detach.

> ❗ Direct wall mounting via screws is not supported; a DIN rail mounting bracket is required for wall installation.

2. Orientamento di montaggio (Mandatory Requirement)

✅ Recommended: Montaggio verticale, terminals up or terminals down (terminals down preferred by manufacturer)

❌ Horizontal flat mounting (housing laid sideways) prohibited

Motivo: Natural convection cooling channels are built inside; horizontal placement severely obstructs heat dissipation, causing heavy power derating, shortened service life or overtemperature protection.

3. Cabinet Clearance for Heat Dissipation (Critico)

Minimum clearance ≥50 mm above the power supply

Minimum clearance ≥20 mm below the power supply

Minimum spacing ≥10 mm on left and right sides from heat-generating components (contattori, relè)

For multiple units mounted side by side: maintain ≥10 mm mutual spacing; tight arrangement leads to heat accumulation.

4. Terminal Wiring Specifications
5. Input terminals: l / N / PE (protective earth)

Cable size: 0.5～2.5 mm² solid or stranded copper wire

Screw torque: 0.6～0.8 N·m

2. Output terminals: +24V / 0V

Cable size: 0.5～2.5 mm²

Screw torque: 0.6～0.8 N·m

> Avoid excessive exposed bare conductors to prevent short circuits; ferrules are recommended for stranded wires.

5. Environmental Mounting Constraints
6. Install only inside control cabinets; no enclosure protection, cannot be deployed outdoors or in damp exposed areas
7. Avoid mounting adjacent to transformers, high-power contactors and other high heat sources
8. Power derating is required if cabinet ambient temperature exceeds 55℃ without ventilation fans
9. Route cables away from inverter and servo drive output cables to reduce electromagnetic interference
10. Additional On-site Mounting Tips
11. The DIN rail shall be reliably earthed; connect the PE terminal of the power supply to protective earth to improve EMC performance and safety
12. For high-vibration sites (trasportatori, macchine utensili), install rail end stops to prevent sliding
13. When multiple power supplies are paralleled, mount them on the same DIN rail and adopt equal-length wiring to minimise circulating current
14. Common Improper Mounting Pitfalls
15. Horizontal flat mounting → poor heat dissipation and overtemperature
16. Insufficient vertical ventilation clearance → high-temperature derating and frequent faults
17. Excessive screw torque causing terminal thread stripping; insufficient torque leading to poor contact and overheating
18. Unconnected PE protective earth → degraded anti-interference performance and potential safety hazards