3 Phase 4 Wire Three Phase Voltage Monitoring Relay Over Under Voltage Protection
♦ Features
-- Compact modular size
-- Neutral loss
-- Three-phase Four-wire monitoring of phase sequence, phase loss, over- and undervoltage and phase unbalance
-- Powered by the measuring circuit
-- 1CO & 1NC contacts
-- 5 LEDs for status indication
♦ Functions
Protection the Phase sequence,Phase Loss,Phase unbalance, Over/Under Voltage and NEUTRAL Loss to protect the equipment(Pump ,Elevator Control Pannel,Blowers,Pumps) from broken
♦ Typical Applications
• Pumps • Fans
• Blowers • Motors
• Compressors
♦ Approvals
• CE • CCC
♦ Technical data
| Type | JVRD-380N |
| Measuring circuit | L1,L2,L3,N |
| Rated voltage | 220VAC,380VAC ,440VAC
460VAV,480VAC,50/60Hz |
| Monitoring functions | phase sequence, phase loss, overvolatege, undervoltage, phase unbalance |
| Voltage setting range | | Type suffix | Overvoltage | Undervoltage | | blank | +15% | -15% | | A | +10% | -10% | | B | +12.5% | -10% | | C | +15% | -12.5% | | T | customized |
|
| Indicators | phase sequence, phase loss, overvolatege, undervoltage, and normal |
| Output contacts | 1CO & 1NC |
| Contact capacity | 6A ,250VAC |
| Dimensions (H x W x D) | 79×23×79mm |
| Mounting | DIN rail |
What is 3 Phase 4 Wire?
Three-phase four-wire system, in the low-voltage distribution network, the transmission line generally adopts three-phase four-wire system, three of which represent A, B, C three-phase, and the other is neutral N or PEN (if the loop power supply) When the neutral point of the side is grounded, the neutral line is also called the zero line (old-fashioned name, which should be gradually avoided, renamed PEN. If it is not grounded, the neutral line cannot be called the neutral line in a strict sense).
In the single-phase transmission line entering the user, there are two lines, one is called the phase line L, and the other is called the neutral line N. The middle line normally passes the current to form the current in the single-phase line. In the system, when the three-phase is balanced, the neutral line (zero line) is currentless, so it is called three-phase four-wire system; in the 380V low-voltage distribution network, in order to obtain the 220V phase voltage from the 380V line voltage, the N line is set. Some occasions can also be used for zero-sequence current detection for monitoring the three-phase power balance.
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Din Rail 4 Wire Three Phase Voltage Monitoring Relay Over Under Voltage Protection Images
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