---
lang: "en"
title: "PFD2-E12 phase monitoring"
sku: "PFD2-E12"
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brand: "MARCOM S.r.l."
end_of_life: "false"
---

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PFD2 -E12 - phase monitoring

The monitoring relay checks for correct phase sequence L1-L2-L3 (right-hand rotation) and complete interruptions of individual phase voltages. The phase voltages to be monitored are connected to terminals L1-L2-L3, and terminals 11, 14 or 21, 24 of the relay's output contacts are connected in front of the motor relay's field coil. If the phase sequence is correct, the output relay activates (the green LED is on). In case of a total phase failure, the output relay returns to the neutral position (the green LED is off). No special supply voltage is required for the monitoring relay. Connect the device to N only if the three phases to be monitored are connected to N via an electrical circuit (e.g., temperature monitoring or similar).

## Technical Specifications

- Supply and measurement voltage L1-L2-L3 | 400 V
- Current consumption 20 mA
- Contacts 2x changeover contact (DPDT)
- Contact material AgNi
- Max switching voltage 250 V AC
- Continuous current max. 6 A
- Switching frequency 1200 cycles/h
- Mechanical endurance 1 x 107 switching cycles
- Electrical endurance 1 x 105 switching cycles
- Display Green LED
- Dimensions (W x H x D) 22.5 x 75 x 95 mm
- Weight 120 g
- Mounting according to IEC 60715 TH35 DIN rail
- Mounting position any
- Side-by-side mounting without spacing
- Housing material Polyamide 6.6 V0
- Terminal blocks Polyamide 6.6 V0
- Ingress protection for housing / terminal block (IEC 60529) IP40 / IP20
- Operating temperature 0 °C to 55 °C
- Storage temperature -20 °C to 70 °C

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Source: https://shop.marcomweb.it/en/voltage-current-phase/pfd2-e12-phase-monitoring

MARCOM S.r.l. — a trusted supplier for industrial automation and building automation.