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Timeguard TX2340 40A 6KA Type B Curve MCB

Timeguard TX2340 40A 6KA Type B Curve MCB

SKU TX2340
£2.47 - £2.47
£2.47 inc VAT £2.06 exc VAT
£2.47 - £2.47
£2.47 inc VAT £2.06 exc VAT inc VAT £2.06 exc VAT
Datasheet

Estimated delivery time: Estimated delivery tomorrow*

Description

The Timeguard TX2340 40A B-curve MCB protects an individual electrical circuit against overload and short circuit. Designed for Timeguard TX series consumer units, this single-pole miniature circuit breaker has a 6kA breaking capacity and occupies one module.

It is a practical choice for electricians selecting a protective device for a compatible consumer unit installation or replacement. The 40A rating must match the circuit design, cable capacity and connected load.

Understand the current rating and tripping characteristic

The 40A current rating, B-curve characteristic and 6kA breaking capacity describe different aspects of the breaker’s performance.

B-curve determines its instantaneous magnetic response to a high current over a short period. The breaking capacity relates to interrupting a short circuit under specified conditions. Neither figure changes the circuit’s permitted continuous load.

When replacing an existing breaker, check the complete specification and consumer unit compatibility rather than matching the amperage alone.

Terminals designed to help prevent incorrect insertion

The terminal cages incorporate blanking plates that help prevent a cable or busbar from being positioned outside the clamp. Maximum terminal capacity is 25mm², with a specified tightening torque of 2.5Nm.

A contact position indicator provides a visible indication of contact status. The breaker can also be removed without removing the busbar, helping with maintenance once the assembly has been safely isolated.

Specification
  • Range - TX circuit protection
  • Product Code - TX2340
  • Product Type - Miniature circuit breaker / MCB
  • Rated Current - 40A
  • Tripping Characteristic - B-curve
  • Number of Poles - Single pole
  • Rated Voltage - 240V AC
  • Short-Circuit Breaking Capacity - 6kA / 6000A
  • Energy Limiting Class - Class 3
  • Protection Functions - Overload and short circuit
  • Module Width - 1 module
  • Mounting - 35mm DIN rail
  • Maximum Terminal Capacity - 25mm²
  • Terminal Tightening Torque - 2.5Nm
  • Terminal Feature - Blanking plates to help prevent incorrect cable or busbar insertion
  • Contact Position Indicator - Included
  • Device Removal - Without removing the busbar
  • Electrical Endurance - 4,000 cycles
  • Mechanical Endurance - 10,000 cycles
  • Dielectric Strength - 2500V
  • Housing Material - PA6
  • Height - 81mm
  • Width - 18mm
  • Depth - 73mm
  • Standards Listed - IEC/BS EN 60898-1 and IEC/BS EN 60947-2
  • Compatibility - Timeguard TX series consumer units only
  • Manufacturer’s Guarantee - 5 years
FAQ's

What is the Timeguard TX2340?

It is a 40A B-curve single-pole miniature circuit breaker with a 6kA breaking capacity. It provides overload and short-circuit protection within compatible Timeguard TX consumer units.

Is TX2340 B-curve or C-curve?

TX2340 is B-curve. The corresponding 40A C-curve model is TX2340C, so check the complete product code when ordering.

What does the 40A rating mean?

It is the device’s rated current under specified conditions. The circuit cable, installation method and load must be suitable for protection at that rating.

Will it trip immediately if the current exceeds 40A?

Not necessarily. Operating time depends on the magnitude and duration of the overcurrent and the breaker’s time-current characteristic.

What is the instantaneous operating band of a B-curve MCB?

Under BS EN 60898-1, the B-curve instantaneous magnetic operating band is 3–5 times rated current. For a 40A device, this corresponds to 120–200A.

Does that mean it can carry 120–200A continuously?

No. That band describes short-duration magnetic operation. The rated current remains 40A.

How does TX2340 differ from TX2340C?

Both are rated at 40A, but their instantaneous magnetic characteristics differ. B-curve has a lower operating threshold than C-curve. They should not be interchanged without checking the circuit design.

Can I replace a 32A breaker with this 40A model?

Only after an electrician verifies that the complete circuit is suitable for 40A protection. Increasing the rating without checking the cable and installation can leave the circuit inadequately protected.

What cable size is required for a 40A MCB?

There is no universal answer based on amperage alone. Installation method, insulation, grouping, ambient temperature, circuit length, voltage drop and fault-protection requirements all affect cable selection.

Is this automatically suitable for an appliance rated below 40A?

No. Appliance instructions, starting characteristics, cable protection, required residual-current protection and the installation design must also be considered.