The Orno WE-521 measures single-phase energy consumption in kWh. An electronic circuit converts current flow and applied voltage into pulses proportional to energy consumed; a flashing LED signals active energy flow. The measured value appears on a 5+2 digit LCD display with backlight.

The meter complies with EN50470-1:2006, EN50470-3:2006 and MID directive 2014/32/EU. It fits a single DIN rail module slot (18mm wide) and is rated IP51.

Key Features

• Single-phase measurement in kWh
• LCD display with backlight — 5+2 digit readout
• Pulse output: 1000 imp/kWh
• Flashing LED energy-flow indicator
• IP51 degree of protection
• DIN rail mount — 1 module (18mm wide)

Product Benefits

• MID-certified (2014/32/EU) — suitable for billing and sub-metering applications
• Accuracy class B provides reliable kWh readings
• Pulse output allows connection to building management or data logging systems
• Backlit LCD ensures legibility in low-light electrical enclosures
• Single-module DIN footprint minimises space in distribution boards

Technical Specifications

• Type: single-phase
• Nominal Voltage: 230V~, 50Hz
• Base Current (Ib): 5A
• Maximum Current (Imax): 40A
• Minimum Current: 0.25A
• Pulse Frequency: 1000 imp/kWh
• Measurement Accuracy Class: B
• Display: LCD backlit, 5+2 digits
• Pulse Output: Yes
• Multi-tariff: No
• Communication Protocol: None
• Ports: None
• Number of Modules: 1
• Degree of Protection (IP): 51
• Dimensions (W×D×H): 18×60×90mm
• Standards: EN50470-1:2006, EN50470-3:2006, MID 2014/32/EU

Why You'll Love It

• MID compliance gives confidence for use in metered or sub-metered installations
• Compact single-module DIN format fits alongside other rail-mounted devices
• No special wiring protocols required — straightforward series connection
• Package includes 1× Orno WE-521 Single Phase Metering 40A and 1× English operation manual