T&R Resistor Box RB10

Enhance relay testing precision with the RB10 Resistor Box. Versatile and reliable, it offers controlled current and multiple resistance ranges.

  • 0.5 ohms to 1666.5 ohms in 8 steps
  • Maximum current 0.2-10A
  • Improves current control into low impedance loads
  • Particularly suitable for solid state relays
  • Can be used as swamping impedance for non-linear loads
  • Thermal cut out


The RB10 Resistor Box works alongside a current injection unit to enable precise testing of low impedance relays and trips. It provides finer control of the current, ensuring accurate results. Designed for use with the 100ADM mk1-5 and 200ADM-P, it can also be used with other suitable current sources.

Featuring eight resistance ranges, the RB10 Resistor Box dissipates a maximum power of 50W per resistor. Its durable aluminium case ensures robustness, while the front panel’s industry-standard 4mm safety sockets facilitate easy connections.

The RB10 Resistor Box operates within a wide temperature range of 0°C to 45°C, ensuring reliable performance in various environments. It includes over-temperature protection and a fused common terminal (T10A fuse) for added safety.

In summary, the RB10 Resistor Box is an indispensable tool for engineers and technicians conducting accurate and controlled testing of low impedance relays and trips. With its compatibility, resistance range options, durable construction, and safety features, it proves ideal for various industries.



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