Siemens Digital Weekly Time Switch 230V 16A 2TE 7LF4521-0 (7LF45210)

With a 16A switching capacity and 50 programmable steps, this Siemens digital weekly time switch delivers precise control for lighting, heating, and other electrical loads in a compact 2TE DIN rail format.

Overview

The Siemens 7LF4521-0 is a digital weekly time switch designed for DIN rail mounting. It operates on 230V AC and provides a single changeover contact rated for 16A resistive load. The device offers weekly, daily, pulse, random, and holiday programming modes, with a minimum switching time of 1 minute. A quartz-controlled clock ensures accuracy of ±1 second per day at 20°C, and a built-in battery backup maintains time and programs for approximately 3 years.

What stands out

• 50 ON/OFF program steps for flexible scheduling
• Manual override with permanent or temporary ON/OFF
• LCD display for easy programming and status indication
• Battery backup retains settings during power outages
• Compact 2TE width fits standard distribution boards

Technical details

• Operating voltage: 230V AC, 50/60 Hz
• Switching capacity: 16A resistive (AC1), 10A inductive (AC3)
• Number of channels: 1 changeover contact (SPDT)
• Programming period: weekly, daily, pulse, random, holiday
• Minimum switching time: 1 minute
• Display: LCD
• Battery backup: yes, approx. 3 years
• Time accuracy: ±1 sec/day at 20°C
• Power consumption: approx. 1 VA / 0.8 W
• Protection: IP20 terminals, IP40 front panel
• Operating temperature: -10 to +55 °C
• Terminal type: screw terminals
• Mounting: DIN rail, 2 TE

Our verdict

A reliable and versatile time switch for professional electrical installations, offering precise scheduling and robust switching capacity in a space-saving design.