GENIE 39421A.S, MOV,SURGE PROTECTOR
The Genie 39421A.S is a mov surge protector for use with Genie commercial door operators. Metal oxide varistor surge protector that clamps AC line transient voltage spikes on Genie commercial operators. Notable features include: clamps ac line transient voltage spikes to protect control electronics; metal oxide varistor technology provides fast-response surge suppression; oem genie commercial line replacement part. Compatible with: Genie commercial door operators, AC-powered commercial gate and door operator control boards, General AC line protection applications compatible with MOV ratings. This is a genuine OEM replacement component for qualified service technicians.
Key Features
- Clamps AC line transient voltage spikes to protect control electronics
- Metal oxide varistor technology provides fast-response surge suppression
- OEM Genie commercial line replacement part
- Helps prevent damage to control boards from lightning and switching transients
- Easy plug-in or wired replacement for field service
Compatibility Guide
- Genie commercial door operators
- AC-powered commercial gate and door operator control boards
- General AC line protection applications compatible with MOV ratings
Professional Specs
| Feature | Specification |
|---|
| Model | Genie 39421A.S |
| Item Type | MOV Surge Protector |
| Voltage | 120V AC, 240V AC (verify clamping voltage rating for application) |
| Materials | Metal oxide varistor element with insulated body |
| Mounting | Board-mounted or wired inline on AC input circuit |
| Alternate Part Numbers | 39421A |
Frequently Asked Questions
Q: What is a MOV and how does it protect my operator?
A: A MOV (Metal Oxide Varistor) is a voltage-dependent resistor that clamps transient voltage spikes on AC power lines, diverting surge energy away from sensitive electronics and protecting control boards from damage.
Q: How do I know if the MOV has failed or needs replacement?
A: MOVs degrade with each surge event they absorb. Signs of failure include visible physical damage (cracking, burning), a tripped breaker after a power event, or recurring control board failures. Periodic replacement is recommended in surge-prone environments.
Q: Does this MOV replace a whole-house surge protector?
A: No. The MOV provides transient spike suppression for the AC line but does not replace a whole-house or panel-level surge protector. Both provide complementary layers of protection.
Q: How do I replace the MOV in my commercial operator?
A: Disconnect AC power to the operator, remove the old MOV (noting orientation and connection points), and install the new MOV in the same position. Restore power and verify normal operation.
Q: What causes the voltage spikes that this MOV protects against?
A: Transient voltage spikes from lightning, utility switching, motor starting, or other inductive loads on the same circuit can damage control boards. The MOV absorbs these spikes before they reach the electronics.
