Nsi Industries ewz120 Astro 7-day Electronic Timer 30A

Product Description

The NSI INDUSTRIES ewz120 is a single-channel, astronomic 7-day electronic timer designed for switching lighting and load circuits in commercial and residential applications. Operating on 120 to 277 volts AC and rated for 30 amps, it uses an SPDT contact form to deliver reliable on/off control with up to 20 programmable events. The built-in capacitor backup retains programming for up to 4 days during a power outage, reducing the need to reprogram after outages. Housed in a tan plastic NEMA 3R enclosure, the ewz120 is surface-mounted and suited for outdoor-rated installations where moisture resistance is required.

This timer is used in outdoor lighting control, parking lot lighting, signage, and security lighting systems where automatic sunrise/sunset switching is preferred over fixed time schedules. The astronomic programming mode adjusts on/off events automatically based on the time of year, eliminating the need for seasonal schedule updates. With a minimum time setting of 1 minute and a maximum of 7 days, it fits a wide range of switching intervals. A licensed electrician typically handles installation in panel enclosures or junction boxes rated for the application.

Key Features

• Astronomic 7-day programming mode automatically adjusts for sunrise and sunset throughout the year
• 30-amp, 120-277V AC rating supports a wide range of load types and voltage configurations
• Up to 20 programmable events with on/off action allocation
• 4-day capacitor backup retains schedule during power interruptions
• NEMA 3R-rated plastic enclosure suitable for outdoor surface mounting
• Single-pole SPDT contact form with 1 HP rating at 120V and 2 HP at 240V

Compatibility

Designed as an OEM-style replacement or new-installation electronic astro timer for single-channel lighting control circuits requiring SPDT switching on 120 to 277V AC systems.

Installation Notes

Installation should be performed by a qualified, licensed electrician in accordance with applicable NEC requirements. Disconnect and lock out all power to the circuit before wiring the timer. Surface-mount the enclosure in a location appropriate for a NEMA 3R-rated device, ensuring no direct water submersion. Do not exceed the rated 30-amp load or exceed the voltage range of 120 to 277V AC.