NJB1-X Relay (Phase Sequence, Phase Failure, Three-Phase Unbalance Protection)

Product category:: Protection Relay
Product code:: P-528
Model:: NJB1-X

Function & Use (Application Scenarios)

Relays, protection relays are mainly applicable to NJB1-X phase sequence, phase loss relays, and are used in AC voltage 380V~480V, frequency 50Hz control circuits as phase sequence, phase loss and imbalance protection devices, to connect or disconnect the circuit, cannot monitor

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Product highlights

Strong breaking capacity
Control response is stable
Engineering Application Compatibility
Stable and reliable operation
Easy system integration

Model

NJB1-X

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Main Product Parameters

CategoryRelay Protection and Automation DevicesSecondary CategoryProtection Relay

Product details

Function and Usage

NJB1-X Phase Sequence and Open Phase Relay, suitable for AC voltage 380V~480V, frequency 50Hz control circuits as phase sequence, open phase, and imbalance protection devices, to connect or disconnect the circuit. It cannot monitor the open phase of motor load.

Detailed Parameters

Parameter Category	Parameter Item	Parameter Value
Rated Control Circuit Power Supply Voltage	Three-phase, Three-wire Mode	AC380V, AC400V, AC415V, AC480V, 50Hz
	Three-phase, Four-wire Mode	AC220V, AC230V, AC240V, AC277V, 50Hz
	Rated Control Circuit Power Supply Voltage Allowable Fluctuation Range	85%Us~110%Us
	Three-phase Imbalance Action	Imbalance Rate: 2%~22%
	Action Time	Open Phase, Phase Sequence ≤0.1s, Imbalance 0.1s~30s Adjustable
	Contact Number	1 Set of Transfer Contacts
	Contact Capacity	Ue/le: AC-15 240V/0.75A, 415V/0.47A; Ith: 3A
	Indication Method	Power: Green LED, Relay Output: Yellow LED, Alarm Indication: Red LED
	Environmental Temperature	-5℃~+40℃
	Installation Method	Device Type, Rail Type
Notes		Can detect the open phase fault of the neutral line (three-phase four-wire), cannot detect the leakage current fault of the neutral line; when working normally, the relay's normally open contact closes, and the action indicator light is on.

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