3079A - Basic Light / Dark Activated Switch

This circuit uses a simple LDR based circuit in super-Darlington set-up to activate the onboard relay (see Relay FAQ for details).

Best suited to applications where the change in light level is large and the transition quick.

The Light/Dark mode switch is used to select either light or dark activation of the relay. This enables the unit to be operated in its low-current standby mode for the majority of the time according to your application.

• Adjustable turn-on sensitivity
• Switch to select either 'light' or 'dark' activation
• LED status indicator

Technical Specifications
Supply	Regulated 12Vdc (Order Code PSU446 with connector 778.106)
Current consumption	Light Activated: <0.5mA standby, <42mA relay active Dark Activated: <0.5mA standby, <40mA relay active
Output Type	1 x SPDT Relay
Maximum Output Load (Resistive)	Up to 240Vac or 28Vdc @ 4 Amps max. (Relay Datasheet)
Output Connections	NO, NC, C (Relay FAQ)
Board Dimensions	33 x 53mm
Fixing Holes	4 x M3
Board Connections	Screw terminal blocks
Product Formats	SELF-ASSEMBLY Electronic Kit (KT ) or PRE-ASSEMBLED Electronic Module (AS) more
Documentation	User Manual