32V Electronic Over Voltage Relay For Type A Or Type B, 28V Voltage Regulators

SKU: ZA000M.
Category: .

Product Description

32V Electronic Over Voltage Relay For Type A Or Type B, 28V Voltage Regulators

What’s included:

  • Installation Drawing
  • Warranty Card
  • Product Eligibility Catalog (PEC)
  • Troubleshooting Notes
  • STC Certificate
  • Instructions For Continued Airworthiness Maintenance (ICA)

Product Features:

Over-Voltage Protection

The OV Protector (OVP) or OV Relay deactivates the Voltage Regulator by removing power to its input if the bus voltage exceeds 32V. This removes excitation from the alter-nator and thus protect sensitive avionics equipment and the battery.

Counter-EMF protected Relay

The OV Relay is a normally closed switch which opens when the bus voltage exceeds 32V. It has a time delay that prevents nuisance tripping caused by system noise or voltage spikes. The regulated bus voltage is normally about 28V unless the alternator is self-current limiting1 or if there is voltage drop in the alternator field circuit breaker, alternator switch, OV Relay, or wiring and connections between the bus and the red wire on the VR. These voltage drops across the different components and connections occur when cur-rent, up-to 3 Amps in some instances, passes through the resistance built-up in them. The resistance build-up causes flickering ammeter and instrument panel lights.

Other Features:

  • Integrated Circuit OV sensor
  • Protects system against overexcited alternator field
  • Increase the life of the OV Relay
  • Less temperature sensitive and more precise.

Additional Information

Weight1 lbs
Dimensions11 × 8.5 × 5.5 in
Model Number


Over Voltage (OV)

32.0V + 0.8V

Max Field Current


Approval Type

FAA-STC Approved

Document Approval

FAA Form 337 Required



OEM PN (Electrodelta)

ELECTRODELTA: OS100-0101, OS100-0102

OEM PN: (Cessna)

CESSNA: C593001-0101, -0102

Replaces OEM PN (LAMAR)

LAMAR: DG02-28

Aircraft Common Name

Skywagon, Super Skylane, Stationair, Super Cargo Master, Turbo Stationair, Centurion, Cardinal, Cardinal RG, Classic, Skyhawk, Hawk XP, Cutlass, Cutlass RG, Powermatic, Skyhawk Powermatic

Approved Aircraft

CESSNA: 152,A152,F152,FA152; 172,N; F172; R172K; 177,A,B,RG; 180,K;182,Q; F182Q; R182; FR182; 185,A185F; 188,A188B,T188C; 206,U206; 207,T207;210,K,L,M,N; P210,N; T210,K,L,M,N

Warranty Policy

Click the links below to download warranty policy in .pdf format.

Warranty Policy (New Manufactured) PDF Requires Acrobat Reader

Warranty Policy (Recertified) PDF Requires Acrobat Reader

V25101 - Zeftronics


Click the links below to download the .pdf


Product Connector FAQ PDF Requires Acrobat Reader

General Product

GCU Cross Reference (Coming Soon)

ACU Cross Reference (Coming Soon)

OVR, OVS, Cross Reference (Coming Soon)

How To

How To Read the Cross Reference Chart FAQ (ACU) PDF Requires Acrobat Reader

How To Read the Cross Reference Chart FAQ (GCU) PDF Requires Acrobat Reader