NSI EWZ103 7-Day Digital Time Switch | 1-Channel DPST, 120-277 VAC, Outdoor NEMA-3R

Overview

The NSI EWZ103 digital time switch is a versatile automation tool designed to run loads indoors or outdoors with precision. It accepts 120-277 VAC input and uses DPST output contacts to switch a 40 A load or a 2 hp motor. The unit automatically detects the input voltage, removing the need for manual voltage setting and simplifying installation.

Flexible daily scheduling

Program a 7 day 24 hour cycle with up to 20 on off points per day. Each on/off cycle can be as short as one minute, enabling fine control for common duties. A built in manual override supports quick on demand adjustments.

Smart timing features

Automatic adjustments for daylight saving time, leap year, and sunrise/sunset variation based on latitude keep schedules aligned with real world daylight patterns without manual recalibration.

Power, reliability, and endurance

A rechargeable super capacitor provides four days of backup power to preserve time and scheduling through brief power interruptions. The EWZ103 is designed to handle reliable switching for loads up to 40 A or motors up to 2 hp.

Durability and installation

The timer sits in a Noryl plastic alloy enclosure meeting NEMA-3R standards for water resistance. It features a lockable hasp and can be mounted on an external surface, making it suitable for both indoor and outdoor settings.

Safety and compliance

UL Listed and CSA certified components reflect a commitment to quality and safer operation in a variety of environments.

Key capabilities

• 7 day 24 hour timer with 20 on/off cycles per day and a one minute minimum cycle
• Automatic voltage detection for 120-277 VAC with 6 W power consumption
• DPST contacts rated for 40 A load or 2 hp motor
• Rechargeable super capacitor backup provides four days of sustained timekeeping
• Automatic daylight saving, leap year, and latitude based sunrise sunset compensation
• Noryl enclosure with locking hasp for indoor outdoor use

Practical use and installation tips

• Controls lighting, heaters, and small equipment motors with predictable schedules
• Ideal for exterior lighting, signage, pumps, and climate control devices
• External surface mounting supports quick integration into existing setups
• UL Listed and CSA certified for added assurance on safety and performance

Typical scenarios

Use cases include outdoor lighting timing for dusk to dawn operations, two or three daily heating cycles, or motorized equipment that benefits from automated start/stop routines. The EWZ103 offers dependable, programmable control without requiring constant monitoring.