Type Y0A8 & Y0A9: Bulb and capillary thermostats, with built-in pilot light and 2 or 3 M20 cable glands



Distance temperature control in professional premises where good protection against liquid splashes or dust is requested.

Output with 2 or 3 cable glands, allowing direct connection of heat tracing cables, radiators or immersion heaters.


Housing: Reduced height, IP44, black PC-ABS fiberglass reinforced, UL94V0. High impact and UV resistance. 2 removable wall mounting lugs.

Cable input: M20 cable glands. Delivered with 2 or 3 cable glands. Special  cable glands for oblong or flat heat tracing cables are available on request. Positioning the cable glands allows variations in the mounting position

Set point adjustment: By °C printed knob for external adjustment models, by screw driver and printed dial on internal adjustment models. °F values available in option

Sensing element: Liquid filled bulb, distance measurement with capillary.

Temperature adjustment ranges: –35+35°C (-30+95°F), 4-40°C (40-105°F), 30-90°C (85-195°F), 30-110°C (90-230°F), 50-200°C (120-390°F), 50-300°C (120-570°F), 100-400°C (210-750°F), 100-500°C (210-930°F).

Capillary length: 1.5 m

Electrical connections:  On screw terminals. (It is possible to connect 2 wires 1.5mm² on each terminal). One main terminal and 3 auxiliary terminals are available for neutral connection. This allows, for example, connecting two heat trace heaters.

Mounting: Wall mounting, by two side lugs with holes for dia. 4mm screws, 69mm distance.

Pilot light: Neon, 230V, standard in red, parallel connection on the load Contact: SPNC (open on temperature rise).

Electrical rating, resistive loads:

16A 250V, 50 ~60Hz: >100000 cycles,

20A 250V, 50 ~60Hz: ≥ 50000 cycles,

10A 400V, 50 ~60Hz: ≥ 50000 cycles.

Electrical rating, inductive loads:

6A 250V, 50 ~60Hz: >100000 cycles

Minimum Storage temperature: -35°C (-30°F)

Maximum ambient temperature: 60°C (140°F)

For more technical information see 8G thermostat technical data sheet


Main references with 3 cable glands*

Temperature ranges °C (°F)

Internal adjustment External adjustment Bulb diameter

(D, mm)

Bulb length

(L, mm)


°C (°F)

Max temperature on bulb

°C (°F)



Y0A9LD135035AO6J Y0A8LD135035AO6J 6 98 3±2 (5.5±4)

55 (130)



Y0A9LD104040AO6J Y0A8LD104040AO6J 6 140 2.5±1.5 (4.5±2,5) 60 (140)


Y0A9LD130090AO6J Y0A8LD130090AO6J 6 87 4±3 (7±5.5)

120 (250)



Y0A9LD130110AO6J Y0A8LD130110AO6J 6 93 5±3 (9±7)

150 (300)



Y0A9LD150200AO6J Y0A8LD150200AO6J 6 59 8±5 (14±9) 250 (480)


Y0A9LD150300AO3J Y0A8LD150300AO3J 3 135 10±5 (18±9)

350 (660)



Y0A9LD1A0400AO3J Y0A8LD1A0400AO3J 3 93 15±5 (27±9) 430 (800)


Y0A9LD1A0500AO4J Y0A8LD1A0500AO4J 4 235 10±5 (18±9)

550 (1000)

*2 cable gland version: replace LD by KD in the reference  

°F printing: replace last character (J) by K



2D&3D Drawing