Bộ Relay Helvar - 498 8 × 16 A Relay Unit

498 8 × 16 A Relay Unit


 8-Channel Relay Unit (498)

The DIGIDIM 498 8-Channel Relay Unit is fitted with high-inrush specification relays, rated at 16 A per channel, which handle short-lived, high-peak inrush currents during switch-on of loads.

It can be networked through either DALI or SDIM communication to be incorporated into a DIGIDIM or Imagine lighting control system.

The unit has an intuitive LED segment display and push buttons for monitoring, manual configuration and control purposes.

 Key Features

  • High-inrush specification relays (single pole, normally open).
  • Wired override input to allow for external triggers.
  • LED segment display and push buttons.
    • Can operate as: 8 individual channels (8 × 1)
    • 4 sets of 2 channels (4 × 2)
    • 2 sets of 4 channels (2 × 4)

Technical Data




Up to 4 mm² solid or up to 2.5 mm² stranded


0.5 mm² – 1.5 mm² solid or stranded. Max. length: 300 m @ 1.5 mm².


0.22 mm² – 1.5 mm² low-loss RS485 type (multistranded, twisted and shielded). Max. length: 1000 m (low-loss cable). Examples: Belden 8102 or Alpha 6222C. Note: One twisted pair for A and B (85 Ω to 100 Ω impedance), one core or twisted pair for 0 V, and shield for screen.

Cable rating:

Mains cables, relay cables and DALI cables must be mains rated.


Mains supply:

100 VAC – 240 VAC (nominal) 85 VAC – 264 VAC (absolute) 45 Hz – 65 Hz

Power consumption:

2.6 W

Standby power consumption:

1.1 W

Internal losses:

2.1 W + max. 1.6 W per channel

External protection:

The mains supply must be protected at 6 A maximum. The relays must be protected by a 16 A Type C MCB maximum.

DALI consumption:

2 mA


Complies with DSI standard v 2.0.


Between every connector, with this exception: ‘SDIM 0 V’ and ‘OVR 0 V’ are not isolated from each other.





Wired override input

User interface:

2 push buttons for configuration


8 (2 channels per four-way connector)

Relay contacts:

High inrush (800 A at 200 μs), single-pole, single-throw (SPST) relay. W premake contact + AgSnO₂. Optimised for high currents.

Relay voltage:

240 VAC (400 VAC between channels)

Max. load per contact:

16 A resistive/incandescent 10 A HID (cos y = 0.6)

Number of devices:

For ballasts, quantity is limited by MCB; refer to manufacturer’s data. These are power relays and therefore not suitable for extra-low voltage operation. Where power relays are used to control contactors, make sure that snubbers are fitted




Mechanical data


160 mm × 90 mm × 58 mm


Plastic (polycarbonate) DIN-rail case


400 g


DIN rail (installation in switchgear/ controlgear cabinet)

IP code:

IP30 (IP00 at terminals)

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


DALI standard IEC 60929, with Helvar additions


Helvar SDIM protocol


DMX512-A protocol (max. refresh rate: 33 Hz)


Complies with WEEE and RoHS directives.

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