MEAN WELL KNX-40E-1280D KNX Power Supply, 30 V, 1280 mA, 38.4 W, diagnostic

At a glance

Output Voltage: 30 V KNX bus with choke
Rated Output Current: 1280 mA
Rated Output Power: 38.4 W
Input Voltage Range: 180 V to 264 V AC
Mounting: DIN Rail
Efficiency (typ.): 86% (before choke)

Model KNX-40E-1280DCurrent model

MEAN WELL KNX-40E-1280D KNX Power Supply, 30 V, 1280 mA, 38.4 W, diagnostic

Price on request

At a glance

Output Voltage: 30 V KNX bus with choke
Rated Output Current: 1280 mA
Rated Output Power: 38.4 W
Input Voltage Range: 180 V to 264 V AC
Mounting: DIN Rail
Efficiency (typ.): 86% (before choke)

Powers the KNX bus so switches, sensors and actuators can talk, for home and building automation, lighting, HVAC, blinds and alarm monitoring. KNX power supply, 30 V, 1280 mA, 38.4 W, diagnostic. EIB / KNX power supply with integrated choke.

Part of the MEAN WELL KNX-40E series. Compare both models

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WarrantyManufacturer warranty under MEAN WELL's terms: 3 years. Warranty claims
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Overview

What it is

The MEAN WELL KNX-40E-1280D is a KNX power supply from the KNX-40E series (1280 mA KNX Power Supply), rated 30 V, 1280 mA, 38.4 W, diagnostic.

What it is used for

Supplies the 30 V KNX bus through its integrated choke so KNX switches, sensors and actuators in a building automation or security installation can communicate, with a second 30 V output for auxiliary devices. MEAN WELL lists applications such as intelligent home control and building automation, lighting, hvac, blinds and shutters, security and alarm monitoring systems, energy management.

Key features

EIB / KNX power supply with integrated choke.
Compact 4SU (72 mm) width, suitable for TP1-256.
Monitors output voltage, output current, bus traffic load and device temperature.
Protections: short circuit, overload (short circuit proof), over voltage.
LED indicators for normal operation, bus reset and bus overload.
Safety extra low voltage (SELV), 180 V to 264 V AC input.

Key Specifications

Output Voltage: 30 V KNX bus with choke (black/red terminal); 30 V auxiliary DC output without choke.
Rated Output Current: 1280 mA.
Rated Output Power: 38.4 W.
Input Voltage Range: 180 V to 264 V AC; 176 V to 280 V DC.
Mounting: DIN Rail.
Diagnostics: D type: diagnostic function, monitoring of output voltage, output current, bus traffic load and device temperature over KNX; one press of RESET resets the bus for 20 s.

Buying considerations

Size the unit with headroom above the connected load and check the derating information in the datasheet for high ambient temperature or low input voltage. Other models in the same series are listed on this page.

Installation considerations

MEAN WELL treats this unit as a component of the final equipment, so approvals and EMC performance should be confirmed for the complete installation. Wiring and safety details are in the official datasheet linked below.

Features

MEAN WELL KNX-40E-1280D KNX Power Supply, 30 V, 1280 mA, 38.4 W, diagnostic, dimension drawing — Check the datasheet for tolerances.

Size and fit

Dimensions: 72 x 90 x 57 mm (W x H x D)
Weight: 0.328 kg
Mounting: DIN Rail

Technical specifications

Key facts

What is it?: KNX power supplyBrand MEAN WELL, model KNX-40E-1280D
What does it output?: 30 V KNX bus with choke, 1280 mA, 38.4 W
What input does it accept?: 180 V to 264 V AC
How does it mount?: DIN Rail
Can it be used outdoors?: IP20
Which documents are available?: Datasheet Open documents

Output

Output Voltage: 30 V KNX bus with choke (black/red terminal); 30 V auxiliary DC output without choke
Rated Output Current: 1280 mA
Rated Output Power: 38.4 W
Ripple and Noise (max.): 100 mVp-p (before choke)
Efficiency (typ.): 86% (before choke)

Input

Input Voltage Range: 180 V to 264 V AC; 176 V to 280 V DC
Input Frequency Range: 47 Hz to 63 Hz

Protection

Short Circuit Current: 2.8 A
Withstand Voltage: I/P to O/P: 4.2 kV AC; I/P to FG: 2 kV AC

Environment

Operating Temperature: -30 °C to +70 °C (see derating curve)
Operating Humidity: 20% to 95% RH non-condensing
Cooling: Free air convection
IP Rating: IP20

Physical

Dimensions: 72 x 90 x 57 mm (W x H x D)
Weight: 0.328 kg
Mounting: DIN Rail

Approvals

MTBF: 1414.2K hrs min. Telcordia SR-332 (Bellcore); 217.1K hrs min. MIL-HDBK-217F (25 °C)

Other

Mains Failure Back-up Time (typ.): 200 ms at 230 V AC, full load
Diagnostics: D type: diagnostic function, monitoring of output voltage, output current, bus traffic load and device temperature over KNX; one press of RESET resets the bus for 20 s
Series: KNX-40E

Warranty: Manufacturer warranty under MEAN WELL's terms: 3 years. How claims work

Product attributes and shipping details

Brand	MEAN WELL
Power Output	38.4 W

Downloads

Documentation

KNX-40E series datasheetPublicDatasheet · Family · meanwell.com
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Questions about this product

What input voltage does the KNX-40E-1280D accept?

MEAN WELL lists 180 V to 264 V AC; 176 V to 280 V DC for this model.

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