SensorWorx SWX-910 Power Pack - Secondary Relay - 120-277VSensorWorx SWX 910 SWX 910 Product Description SensorWorx power pack controllers transform incoming line voltage power to Class 2 low voltage as needed by sensors or other control devices. Additionally, they switch on off power to the connected lighting load as directed by the sensors and controls. SensorWorx power packs utilize a powerful microprocessor to optimize its switching timing in order to ensure long relay life even when controlling high