Specifications
| ARB-33 | |
|---|---|
| Circuit | Millivolt (thermopile) — for use with millivolt gas systems |
| Rating | 5 VDC max · 0.67A max |
| Temperature range | OFF to 93–204°C (200–400°F) |
| Dial travel | 310° |
| Capillary | Copper Ø2.0mm, nickel-plated; length made to inch specification (24″ / 30″ / 36″ and other lengths to order) |
| Bulb | Copper, nickel-plated, Ø9.5 × 125mm |
| Gland (stuffing box) | 1/4″ NPT or 3/8″-18 NPT, to order (drawings ARB-33-204U / ARB-33-204Q) |
| Terminals | Brass screws, #6-32 |
| Certification | UL Recognized Component, file E491946 (UL 60730-1 / UL 60730-2-9) · CE certified |
Technical data is a catalogue reference. Confirm final ratings, dimensions and approvals for the selected model before ordering.
The family
Operating control. Adjustable millivolt thermostat for gas fryers, ovens and ranges.
Millivolt · 200–400°F · capillary to order
Control + protection. Operating control combined with a protective thermal cut-out in one unit.
Control and safety in one body
Manual-reset safety limiter. Thermal cut-out that trips on over-temperature and stays open until manually reset.
Standard trip 232°C (450°F) · other trip points to order · DC 0–50V / 1A for millivolt circuits · capillary & gland to order · series also available in AC ratings up to 400V / 30A
Automatic-reset safety limiter. Thermal cut-out that trips on over-temperature and resets as the equipment cools.
Trip point set to order
All four series are covered by UL file E491946. The VL-S series is also CE certified.
Replacement cross-reference
Built to the same millivolt operating envelope as the Robertshaw 5300-series controls it replaces. Send us the original part number — capillary length, bulb and gland are made to the inch specification of the original part.
| Original part | HengTherm equivalent | Specification |
|---|---|---|
| Robertshaw RX-1-36 | ARB-33 | 1/4″ NPT gland · 36″ capillary · 200–400°F |
| Robertshaw RX-2-24 | ARB-33 | 3/8″-18 NPT gland · 24″ capillary · 200–400°F |
| Robertshaw RX-10-24 | ARB-33 | 3/8″-18 NPT gland · 24″ capillary · 200–400°F |
| Robertshaw LCHM050300000 | VL-S | Manual reset · 450°F (232°C) trip · 30″ capillary |
| Robertshaw LCCM200300000 | VL-Z | Automatic reset · 450°F (232°C) trip · 30″ capillary |
HengTherm parts are replacement equivalents manufactured by Guangzhou V.Crown Thermostat Co., Ltd. They are not manufactured by, or affiliated with, Robertshaw. Part numbers are used for cross-reference identification only.
UL & CE certification
The ARB-33, ARB-33D, VL-S and VL-Z series are UL Recognized Components under file E491946 (US certificate UL-US-2412050-1, Canada UL-CA-2410266-1; UL 60730-1 / UL 60730-2-9), issued 20 November 2024 to Guangzhou V.Crown Thermostat Co., Ltd. Verify on UL Product iQ (search E491946). The ARB-33 series is also CE certified. The VL-S series is also CE certified (EN 60730-1 / EN 60730-2-9 test report, 2024).
Certifications · UL certificate (PDF)
Downloads
- ARB-33-204Q — technical drawing, 3/8″-18 NPT gland (PDF)
- ARB-33-204U — technical drawing, 1/4″ NPT gland (PDF)
- VL-S-232A — technical drawing, manual-reset safety limiter, 232°C trip (PDF)
- VL-S-232B — technical drawing, manual-reset safety limiter (PDF)
- VL-Z-232A — technical drawing, automatic-reset safety limiter (PDF)
Customization & samples
Capillary length, gland thread, dial printing and limiter trip points are made to order; development for mechanical customization is free of charge. Free samples of the ARB-33 and VL series are available for bench testing — you only cover the courier, and the freight is credited against your first order. Trial orders start from 200 pcs, with models mixed in one shipment.
Applications
- Gas deep fryers
- Gas ovens and ranges
- Gas griddles
- Gas-heated food service equipment
FAQ
Is the ARB-33 a direct replacement for a Robertshaw RX thermostat?
It is built to the same millivolt operating envelope — 200–400°F, 5 VDC / 0.67A max — with the capillary length, bulb size and gland thread made to the inch specifications of the RX-1-36, RX-2-24 or RX-10-24 it replaces. Check the model drawings (downloads above) against your part before ordering.
What certification does the ARB-33 carry?
UL Recognized Component, file E491946, for the US (XACX2) and Canada (XACX8) to UL 60730-1 and UL 60730-2-9 — verifiable on UL Product iQ. The ARB-33 series is also CE certified.
Can I order a different capillary length or dial?
Yes. Capillary length, gland (1/4″ or 3/8″ NPT), dial printing and limiter trip points are made to order, and development for mechanical customization is free.
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