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Mean Well KNX-20E-640 KNX Power Supply 640mA 640A
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Mean Well KNX-20E-640 KNX Power Supply 640mA 640A
Overview
KNX-20E-640 is the model of this series: rated current 640mA, rated power 19.2W, typical efficiency 86%.
The KNX Power Supply KNX-20E-640 is a 640mA power supply with high efficiency and a small footprint of only 3SU (52.5 mm).The device has a KNX bus choke output and an additional output for ancillary power.The -30~+70°C wide temperature operating range can meet all kinds of applications. LED indicators are used in case of normal operation,overload conditions and RESET operation. It is perfectly suitable to power up any products labeled with the KNX trademark. With over 30 years of industrial power supply experience, KNX-20E-640 is engineered to be a reliable and safe solution for KNX bus environment.
Features
- EIB / KNX power supply with integrated choke
- Compact size with 3SU(52.5mm) width
- Safety extra low voltage(SELV)
- 180~264VAC input
- No load power consumption <0.5W
- Protections: Short circuit / Overload(short-circuit-proof) / Over voltage
- Cooling by free air convection
- Isolation classⅠ
- LED indicator for normal operation, bus reset and bus overload
- Installed on DIN rail TS-35/7.5 or 15
- Over voltage category Ⅲ
- 100% full load burn-in test
- 3 years warranty
Specifications
OUTPUT
- BUS OUTPUT VOLTAGE WITH CHOKE
- Bus,30V (KNX black/red terminal block)
- DC OUTPUT VOLTAGE WITHOUT CHOKE
- 30V(Additional output for ancillary power)
- RATED CURRENT
- 640mA
- RATED POWER
- 19.2W
- RIPPLE & NOISE (max.)Note.2
- 100mVp-p
- SHORT CIRCUIT CURRENT
- 1.4A
- SETUP, RISE TIME
- 1000ms, 50ms/230VAC at full load
- AC MAINS FAILURE BACK-UP TIME(Typ.)
- 200ms/230VAC at full load
INPUT
- VOLTAGE RANGE
- 180 ~ 264VAC 230 ~ 370VDC
- FREQUENCY RANGE
- 47 ~ 63Hz
- EFFICIENCY (Typ.)Note.3
- 86%
- AC CURRENT (Typ.)
- 0.22A/230VAC
- INRUSH CURRENT (Typ.)
- COLD START 40A/230VAC
- LEAKAGE CURRENT
- <1mA / 240VAC
PROTECTION
- OVERLOAD
- 205 ~ 235% rated output power Protection type : Constant current limiting, recovers automatically after fault condition is removed
- OVER VOLTAGE
- 33 ~ 35V Protection type : Shut down o/p voltage, re-power on to recover
FUNCTION
- RESET
- Physical button for reset the bus (Press the RESET button for at least 20 seconds to reset the KNX Bus)
- LED DISPLAY
- Green LED (ON) :Normal operation Red LED1 (Reset):Reset the bus; Red LED2 (Ⅰ>Ⅰmax ):Overload/Short
- CHOKE
- One integrated choke
ENVIRONMENT
- WORKING TEMP.
- -30 ~ +70℃ (Refer to "Derating Curve")
- WORKING HUMIDITY
- 20 ~ 95% RH non-condensing
- STORAGE TEMP., HUMIDITY
- -40 ~ +85℃, 10 ~ 95% RH non-condensing
- VIBRATION TYPE OF PROTECTION
- 10 ~ 500Hz, 2G 10min./1cycle, 60min. each along X, Y, Z axes
- TYPE OF PROTECTION
- IP20 design
- OVER VOLTAGE CATEGORY
- Ⅲ; According to EN61558, EN50178,EN60664-1, EN62477-1 ; altitude up to 2000 meters
SAFETY & EMC (Note 4)
- SAFETY STANDARDS
- EN61558-1,EN61558-2-16; EN50491-3, EAC TP TC 004 approved
- WITHSTAND VOLTAGE
- I/P-O/P:4KVAC I/P-FG:2KVAC O/P-FG:1.25KVAC
- ISOLATION RESISTANCE
- I/P-O/P, I/P-FG:100M Ohms / 500VDC / 25℃/ 70% RH
- EMC EMISSION
- Compliance to EN50491-5-2,-5-3;EN61000-3-2,-3-3, EAC TP TC 020
- EMC IMMUNITY
- Compliance to EN50491-5-2,-5-3;EN61000-4-2,3,4,5,6,8,11, heavy industry level, criteria A, EAC TP TC 020
OTHERS
- MTBF
- 109K hrs min. MIL-HDBK-217F (25℃)
- DIMENSION
- 52.5*90*54.5mm (W*H*D)
- MOUNTING
- 35mm mounting rail according to DIN EN60715
- PACKING
- 0.215Kg ; 60pcs/13.9Kg/0.97CUFT
Test conditions and notes5
- 1. All parameters NOT specially mentioned are measured at 230VAC input, rated load and 25℃ of ambient temperature.
- 2. Ripple & noise are measured at 20MHz of bandwidth by using a 12" twisted pair-wire terminated with a 0.1uf & 47uf parallel capacitor. Measure before Choke.
- 3. Efficiency before choke.
- 4. The power supply is considered a component which will be installed into a final equipment. The final equipment must be re-confirmed that it still meets EMC directives. For guidance on how to perform these EMC tests, please refer to “EMI testing of component power supplies.” (as available on http://www.meanwell.com)
- 5. The ambient temperature derating of 3.5℃/1000m with fanless models and of 5℃/1000m with fan models for operating altitude higher than 2000m(6500ft).
Technical drawings
Typical applications
- Intelligent home control
- Modern building automation
- Lighting control
- HVAC system
- Security system
- Blinds and shutters
- Monitoring systems
- Energy management
- Alarm monitoring
Downloads
Datasheet1
Certificates6
Test reports1
FAQ
Can I use the KNX-20E-640 in a small KNX control panel for building automation?
Yes. This model is a 30V KNX power supply rated at 19.2W with a 640mA output, which fits small KNX building automation panels where a DIN rail form factor is preferred. Its 90.0 × 54.5 × 52.5 mm housing also suits compact control cabinets.
Is the KNX-20E-640 suitable for PLC and industrial automation cabinets that include KNX devices?
It is suitable where the cabinet uses a 30V KNX power supply and the required load stays within 19.2W and 640mA. The DIN rail format and 90.0 × 54.5 × 52.5 mm size make it practical for slim control cabinet layouts. It is intended as an EIB/KNX power supply with an integrated choke.
Can this power supply be used in a building management enclosure with limited space?
Yes. The KNX-20E-640 is built as a DIN rail power supply and has a relatively narrow 54.5 mm width, which helps in crowded building management enclosures. Its 30V KNX output and integrated choke are aligned with KNX control applications rather than general-purpose cabinet power.
Is the KNX-20E-640 meant for open-air use, or should it stay inside a control cabinet?
This unit is better suited to protected use inside a control cabinet or enclosure. The listed operating temperature is -30°C to +70°C, but no IP rating is provided in the product specs. For that reason, it should be matched to enclosed indoor control-panel environments rather than exposed locations.
How does the KNX-20E-640 compare with the other Mean Well KNX series power supplies?
Within this sibling group, the KNX-20E-640 and KNX-20U-640 are both 19.2W, 30V, 640mA models. The KNX-40E-1280 and KNX-40E-1280D are both 38.4W, 30V, 1280mA models. This makes the 20-series the lower-capacity option in the family, while the 40-series doubles the wattage and current at the same 30V output.
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