Mighty Mule FM600 RB570 Transformer - 18 Volt/40VA - MM UL ONLY
The RB570 is an 18VAC 40VA transformer used on many UL-rated Mighty Mule, GTO, and Linear PRO gate operator systems. Its job is to supply low-voltage AC power to the control board so the board can maintain the gate opener battery.
A failing transformer can cause low battery symptoms, weak gate movement, repeated beeping, or a gate that operates until the battery drains. However, the transformer is only one part of the charging system. Bad wiring, a failed battery, a blown fuse, or a damaged board charging circuit can create similar symptoms.
This transformer should be matched carefully because older GTO/Mighty Mule systems may use 14VAC transformer references such as RB502, while newer UL-rated systems commonly use the 18VAC RB570. Installing the wrong voltage transformer can damage components or leave the battery uncharged.
Compatible With
This part is commonly associated with the following Mighty Mule, GTO, and Linear PRO applications. Always match the part number, operator model, and parts diagram before ordering because older and newer generations may use similar-looking parts.
- Many UL-rated Mighty Mule swing and slide gate openers requiring 18VAC 40VA transformer input
- Commonly listed for MM260, MM262, MM360, MM560, MM562, FM200, FM350, FM500, FM502, FM600, FM700, and FM702 where specified
- Commonly listed for LPS13, SL2000B, and SL2200B applications where specified
- Select GTO/Linear PRO operators including PRO2000, PRO3000, PRO4000, SL-1000, and SL-2000 UL-era systems where 18VAC 40VA is specified
- Not for MM271, MM272, MM371W, MM571W, or MM572W where manufacturer notes exclude this transformer
- Not a substitute for RB502 14VAC transformer applications
Features and Specifications
| Manufacturer | Linear / Mighty Mule / GTO |
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| Product Type | Replacement transformer |
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| Part Number | RB570 |
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| Voltage | 18 VAC output |
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| Power Rating | 40VA |
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| Application | Battery charging power supply for compatible gate operators |
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| Compatible Operator Type | Select UL-rated Mighty Mule, GTO, and Linear PRO DC gate systems |
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| Notes | Do not substitute for 14VAC RB502 applications |
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Also Known As / Related Part Numbers
- RB570
- LIN-RB570
- GTO RB570
- Mighty Mule RB570
- 18VAC 40VA transformer
- 18 Volt 40VA transformer
- RB570 replacement transformer
- RB709U related receiver application reference
Technician Note
When a gate shows low battery symptoms, check the battery age, transformer output, wiring to the control board, and charge fuse. Replacing the transformer without checking the battery and charge circuit can miss the real fault.
Before Ordering
- Confirm the operator manual calls for an 18VAC 40VA transformer.
- Do not use RB570 in applications that call for RB502 14VAC.
- Check whether the operator is a UL-rated post-2000 style system.
- Inspect transformer wiring for damage, corrosion, or splices exposed to weather.
- Confirm the battery is still able to accept a charge.
Important Ordering Warnings
- Do not connect this transformer directly to the battery.
- Do not use this as a universal power supply for unrelated access control equipment.
- High-voltage outlet work should be handled by a qualified electrician or gate technician.
Professional Advisory
Transformer replacement involves low-voltage wiring at the operator, but the transformer plugs into line voltage. If the outlet, wiring, or enclosure is damaged, have a qualified technician correct the issue before reconnecting the system.
Product Questions and Answers
What voltage is the RB570 transformer?
RB570 is an 18 volt AC transformer rated at 40VA.
Is RB570 compatible with every Mighty Mule opener?
No. It is used on many UL-rated Mighty Mule systems, but some models are excluded and some older systems use a 14VAC transformer instead.
Is RB570 the same as RB502?
No. RB570 is 18VAC, while RB502 is a 14VAC transformer for specific older or different operator applications.
Will a new transformer fix a dead battery?
Only if the transformer is the cause. A weak battery, bad charge fuse, damaged wiring, or failed board charging circuit can also prevent charging.
Can I use this transformer outdoors?
Use it only as directed by the operator manual. Protect wiring and connections from weather, and correct damaged outlet or enclosure conditions before use.
