CHINT NJB1-X Phase Sequence, Phase Failure & Unbalance Protection Relay

The CHINT NJB1-X protects three-phase equipment against phase loss, reversed phase sequence and voltage unbalance. DIP switches set 3-wire or 4-wire mode, the supply voltage and the power-on delay. Front dials adjust the unbalance level (2–22%) and trip delay (0.1–30s), and LEDs show status. It resets automatically, is built to IEC/EN 60947-5-1 and fits a 35mm DIN rail or screws to a panel.

Specifications

• Brand & Series: CHINT NJB1 Series
• Model: NJB1-X
• Product Type: Multi-Topology Voltage Protection Relay
• Supported System Topologies: 3-Phase 3-Wire (AC380V, 400V, 415V, 480V) | 3-Phase 4-Wire (AC220V, 230V, 240V, 277V)
• Auxiliary Power Supply Terminals: L1, L2
• Rated Control Supply Voltage (Us): DIP-Switch Selectable (380V/400V/415V/480V in 3W | 220V/230V/240V/277V in 4W)
• Protection Functions: Phase Loss, Phase Sequence Reversal, Three-Phase Voltage Unbalance
• Unbalance Rate Adjustment Range (ASY): Adjustable 2% to 22%
• Unbalance Trip Delay Time (T): Adjustable 0.1s to 30s
• Phase Loss & Sequence Response Time: ≤ 0.1s
• Power-On Lock Time (T1): DIP-Switch Selectable: 1s or 5s
• Conventional Thermal Current (Ith): 3A
• Rated Operational Current (Ie / AC-15): 0.75A at 240V AC | 0.47A at 415V AC
• Compliant Standard: IEC/EN 60947-5-1
• Enclosure Protection Rating: IP20
• Mounting: Standard 35mm DIN Rail or Direct Screw Mounting

Price: KSh 2,357 (VAT inclusive).

Installation should be done by a qualified electrician, with the power off at the main switch. Clean with a dry cloth only.

Available from Kenyos Wood & Interiors. We are open Monday to Saturday, 8am to 6pm. Contact us to check stock before you visit.