Type Y038 & Y039: Bulb and capillary thermostats


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

Electrical input: One M20 cable gland.

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

Electrical connections:  3 screw terminal connection block

Mounting: Wall mounting, by two side lugs with holes for dia. 4 mm screws, 63 mm distance.

Contact: SPDT

Electrical rating, resistive loads:

 -Open on temperature rise contact (C-1)

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

20A 250V, 50 ~60Hz: ≥ 50000 cycles,

10A 400V, 50 ~60Hz: ≥ 50000 cycles.

-Close on temperature rise contact (C-2) : 6A 250V 50 ~60Hz: >100000 cycles

Electrical rating, inductive loads:

 -Open on temperature rise contact (C-1): 6A 250V, 50 ~60Hz: >100000 cycles

-Close on temperature rise contact (C-2):0.6A 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



Temperature ranges °C (°F) Internal adjustment External adjustment Bulb diameter

(D, mm)

Bulb length

(L, mm)


°C (°F)

Max temperature on bulb

°C (°F)

-35+35°C (-30+95°F)

Y039GB-35035AO6J Y038GB-35035AO6J 6 98 1,6±1°C (2,9±2°F) 55 (130)
4-40°C (40-105°F) Y039GB004040AO6J Y038GB004040AO6J 6 140 1±0.5°C (1,8±1°F)

60 (140)

30-90°C (85-195°F)

Y039GB030090AO6J Y038GB030090AO6J 6 87 2.5±1°C (4,5±1,8F) 120 (250)
30-110°C (90-230°F) Y039GB030110AO6J Y038GB030110AO6J 6 93 2.5±1°C (4,5±1,8F)

150 (300)

50-200°C (120-390°F)

Y039GB050200AO6J Y038GB050200AO6J 6 59 4±2°C (7±3.6F) 250 (480)
50-300°C (120-570°F) Y039GB050300AO3J Y038GB050300AO3J 3 145 10±5 (18±9)

350 (660)

100-400°C (210-750°F)

Y039GB100400AO3J Y038GB100400AO3J 3 93 10±5 (18±9) 430 (800)
100-500°C (210-930°F) Y039GB100500AO4J Y038GB100500AO4J 4 235 10±5 (18±9)

550 (1000)

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



2D&3D Drawing