The Circutor TQ-6 (code M74027) is a single-phase split core current transformer with a 250/5 A transformation ratio, designed to fit conductors and busbars up to 20 x 30 mm. The core opens with a button press, allowing the unit to be clipped onto a live conductor with no need to shut off power. Rated burden is 1 VA at Class 1 and 2 VA at Class 3.

Technical specifications:

• Model: TQ-6
• Circutor code: M74027
• EAN: 8433059299866
• Transformation ratio: 250/5 A
• System: Single-phase
• Rated burden: 1 VA (Class 1), 2 VA (Class 3)
• Safety factor (SF): 10
• Maximum busbar/conductor aperture: 20 30 mm
• Operating voltage: 0.72 kV AC max.
• Nominal frequency: 50/60 Hz
• Insulation voltage (S1-S2): 3 kV
• Thermal short-circuit current (Ith): 60 In
• Dynamic current (Idyn): 2.5 Ith
• Overall dimensions (W H D): 80 98.5 28 mm
• Enclosure: Self-extinguishing plastic, UL 94 V0
• Protection class: IP 20
• Thermal class: B (+130 C)
• Working temperature: -5 to +40 C
• Storage temperature: -40 to +85 C
• Relative humidity: 15-85% (non-condensing)
• Mounting: Wall mount or DIN rail (accessory required for DIN rail)
• Weight: 0.3 kg
• Maximum installation altitude: 1000 m
• Standards: UNE-EN 61869-1, UNE-EN 61869-2, UNE 21031, UL 94

Features and benefits:

• Button-operated split core enables installation on energised conductors, eliminating the need for a planned outage.
• Accepts busbars and cables up to 20 30 mm, covering a broad range of standard conductor cross-sections.
• Self-extinguishing V0 plastic housing limits fire propagation in the event of an electrical fault.
• Dual-frequency rated at 50/60 Hz, suitable for European and international grid infrastructures.
• Optional DIN rail mounting accessory allows tidy integration alongside other panel-mounted equipment.

Applications:

• Current measurement and energy monitoring in single-phase circuits where supply interruption is not permitted.
• Retrofit metering on existing busbars and cable runs in industrial or commercial switchboards.
• Supplying a 5 A secondary signal to energy analysers, power meters, and protection relays.
• Non-invasive sensor installation in building energy management and sub-metering systems.

Also known as: Circutor TQ-6, TQ-6 M74027, split core current transformer 250/5A, button opening current transformer, busbar CT 20x30mm.