Istec SpeedSys T10 single-channel speed monitor
Istec SpeedSys T10 is a single-channel speed monitor and switch: one sensor input, two high-speed relays, a 4–20 mA output, a frequency output and Modbus TCP. It is Istec’s functional replacement for the discontinued Jaquet T401, T402 and T412. MK-Controls Oy is the Istec distributor in Finland.
T10 in 3D – from speed sensor to relay
Follow one speed sensor signal through the T10 to the relay, the 4–20 mA output and Modbus. The scenario is illustrative, not real plant data. Press play or pick any chapter.

- One channel, fully equipped. Two high-speed relays, 4–20 mA, frequency output, digital input and Modbus TCP.
- Fast and precise. 0.3 Hz to 35 kHz at 0.05 % accuracy; relay hardware reacts in 4 ms or less.
- Compact. 22.5 mm wide DIN-rail housing.
- Replaces Jaquet. T401, T402 and T412.
Planning a tachometer replacement?
Send us the Jaquet type and the number of units and we will recommend the matching SpeedSys. Quoted prices are available for multiple units. Need just one unit? Order it directly from our webshop.
Frequently asked questions
Which Jaquet units does T10 replace?
Istec developed T10 as the functional replacement for the Jaquet T401, T402 and T412. For the T411, Istec offers T11 with an integrated display. Tell us your Jaquet type and we confirm the matching SpeedSys unit before you order.
Which sensors can I connect?
Three-wire Hall, PNP, NPN and eddy-current sensors, or two-wire electromagnetic sensors. The input monitors the sensor circuit for breaks.
How fast does the relay switch?
The relay hardware reacts in 4 ms or less. Typical total reaction is 14 ms or less at the default measuring time and 6 ms or less at 2 ms.
Is T10 a protection system?
SpeedSys T10 is a speed monitor and switch. If you need certified overspeed protection, ask us about SpeedSys 200.
More from this series: All SpeedSys models · T20 explainer · T30 explainer.
Sources: Istec SpeedSys datasheet v1.20, Istec’s functional-replacement letter for the Jaquet T4xx/T5xx/T6xx range and Istec’s life-cycle statement of 26 April 2024. Jaquet is a trademark of its owner TE Connectivity. SpeedSys is developed and manufactured by Istec; MK-Controls Oy supplies Istec products in Finland.