This pluggable bushing current transformer snaps directly onto the 3NJ6 switch disconnector frame – no brackets, no screws. It measures the primary current flowing through the cable that passes through its 21 mm opening and converts it to a standard 5 A secondary signal that any panel ammeter or energy meter can read.

Key Specifications

• 50/5 A ratio: a 50 A primary current produces 5 A on the secondary, matching standard instrument inputs.
• Class 1 accuracy, 1.5 VA burden: sufficient for analogue and digital panel meters. The 1.5 VA burden keeps the secondary circuit simple, without excessive voltage drop on the wiring.
• FS 5 overcurrent limiting factor: the core saturates when the primary current reaches 5× the rated value (250 A), protecting the connected meter from short‑circuit damage.
• 21 mm cable opening: accepts feeder conductors up to approximately 25 mm² without forcing the cable.
• Rated 50/60 Hz, 0.72 kV operational / 3 kV insulation: suitable for all standard low‑voltage distribution systems.

Technical Specifications