GTO RB570 Transformer - 18 Volt/40VA - SW2000/3000/4000-SL1000/2000 UL ONLY
The GTO RB570 is an 18 volt, 40VA transformer used to supply low-voltage charging power to select GTO, Linear Pro Access, and Mighty Mule gate opener control boards. In these systems, the gate operator typically runs from a 12 VDC battery, while the transformer maintains the battery charge through the board. A failed transformer, damaged low-voltage wire, weak battery, or bad charging circuit can all create similar symptoms, so the charging system should be checked as a complete circuit.
This transformer is commonly tied to UL-only versions of GTO/Linear swing and slide operators, including select SW2000, SW3000, SW4000, SL1000, and SL2000 applications when the manual or parts diagram specifies an 18 VAC 40VA transformer. It should not be substituted for a random wall transformer with a different voltage or VA rating. Incorrect transformer output, shorted wires, corroded terminals, or using the wrong terminals on the board can damage the control system or leave the gate with poor battery charging.
Features & Specifications
| Manufacturer | GTO / Linear Pro Access / Mighty Mule |
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| Product Type | Low-voltage charging transformer |
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| Part Number | RB570 |
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| Application | Battery charging transformer for select gate opener control boards |
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| Voltage | 18 VAC output |
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| Power Rating | 40VA |
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| Input | Standard plug-in transformer for compatible systems |
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| Compatible Operator Type | Select 12 VDC GTO/Linear/Mighty Mule swing and slide gate operators |
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| Important Note | UL-only applications where specified by the operator manual |
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| Notes | Not a universal transformer; match original rating and operator manual |
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Compatible With
Commonly associated applications include systems that specify the RB570 or 18 VAC 40VA transformer, such as:
- Select GTO PRO SW2000 / SW2000XL / SW2000XLS family applications when specified
- Select GTO PRO SW3000 / SW3000XL / SW3000XLS family applications when specified
- Select GTO PRO SW4000 / SW4000XL / SW4000XLS family applications when specified
- Select GTO SL1000 and SL2000 UL-only slide gate operator applications when specified
- Select Linear Pro Access 12 VDC gate operator charging systems
- Select Mighty Mule / GTO systems using an 18 VAC 40VA transformer through the control board
- Replacement charging transformer applications where the original part number is RB570
Also Known As / Related Part Numbers
- RB570
- GTO RB570
- Linear RB570
- Mighty Mule RB570
- 18 Volt 40VA transformer
- 18 VAC 40VA gate opener transformer
- 18V 40VA transformer
- UL only transformer
- GTO 18 volt transformer
- Linear Pro transformer RB570
Technician Note
A flashing low-battery symptom is not always a bad transformer. Check the battery under load, low-voltage wire continuity, transformer output, board charging input, and terminal condition before replacing parts.
Before Ordering Checklist
- Confirm the operator manual calls for RB570 or 18 VAC 40VA output.
- Inspect the low-voltage wire for cuts, splices, corrosion, or shorts.
- Load-test the 12 V battery before assuming the transformer is bad.
- Confirm the transformer is connected to the correct charging terminals.
- Use a qualified electrician for unsafe outlets, high-voltage problems, or damaged AC wiring.
Professional Advisory
Do not modify high-voltage wiring or bypass damaged electrical components. If the AC outlet, transformer plug, or charging circuit appears burned, wet, or unsafe, discontinue use and have the system inspected.
Product Questions & Answers
What does the RB570 transformer do?
It supplies 18 VAC, 40VA charging power to compatible gate opener control boards so the operator battery can stay charged.
Is the RB570 the same as a 12 volt transformer?
No. The RB570 is commonly listed as an 18 VAC 40VA transformer. Do not replace it with a random 12 volt transformer.
What operators use the RB570?
It is commonly associated with select GTO/Linear SW2000, SW3000, SW4000, SL1000, and SL2000 UL-only applications when the manual specifies it.
Will a new transformer fix a dead gate?
Not always. A dead or weak gate can also be caused by a bad battery, cut low-voltage wire, bad board, blown fuse, corrosion, or a failed outlet.
Can the transformer wires be extended?
Low-voltage wire runs must be sized and installed correctly for the distance and environment. Follow the operator manual and use direct-burial rated wire where required.
