Bộ Relay Helvar - 494 4 × 10 A Relay Unit

494 4 × 10 A Relay Unit


 4-Channel Relay Unit (494)



 The 4-Channel Relay Unit is a DALI-compatible interface unit designed to allow nondimmable loads to be incorporated into a DIGIDIM lighting control system. The relay unit is a DIN-rail mounted unit that can control four individually programmable relays. The relays are ‘normally open’, volt-free and can switch resistive loads of up to 10 A.

The relay unit is provided with a status LED, a physical selection switch and four relay state indicators. The status LED provides status and a fault indication. The physical selection switch is used to identify the device during system configuration and also acts as a manual override. The four relay state indicator LEDs are illuminated when the respective relay is closed.

Note: This unit does not contain a DALI power supply. Therefore, one must be present elsewhere in the system.

Key Features

  • Four individually programmable relays, normally open and volt-free.
  • Relays are internally isolated permitting separate phases to be controlled in one unit.
  • Each relay can be manually controlled using the physical selection switch.
  • All DALI functions are programmed with either DIGIDIM Toolbox or Designer software.
  • DIN-rail mounted and only 88 mm wide.


Technical Data


Relay loads (max.)


10 A


8 A


5 A

Electronic ballasts:

15 pcs Helvar Type EL–HF/CHF



Solid core up to 4 mm²Stranded up to 2.5 mm²

DALI cable:

Removable connector blocksWire section: 0.5 mm² – 1.5 mm² stranded or solid core

Cable rating:

All cables must be mains rated. Note: If equipment is used in an electrically noisy environment, the DALI cable should be screened and connected to the earth.


Mains supply:

220 VAC – 240 VAC50 Hz – 60 Hz

Mains supply output:


DALI consumption:

2 mA

Mechanical data


88 mm × 58 mm × 90 mm


DIN-rail case 88 mm wide


300 g


DIN rail (installation in switchgear/controlgear cabinet)

IP code:





Operating and storage conditions

Ambient temperature:

0 °C to +40 °C

Relative humidity:

Max. 90 %, noncondensing

Storage temperature:

−10 °C to +70 °C

Conformity and standards

EMC emission:

EN 55015

EMC immunity:

EN 61547


EN 61347-2-11


4 kV


Complies with WEEE and RoHS directives.


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