PA-28 pilot reported landing safely after experiencing loss of electrical power.

Attributes
ACN	1685829
Time
Date	201909
Local Time Of Day	0601-1200
Place
Locale Reference	ZZZ.Airport
State Reference	US
Environment
Flight Conditions	VMC
Aircraft 1
Make Model Name	PA-28 Cherokee/Archer/Dakota/Pillan/Warrior
Operating Under FAR Part	Part 91
Flight Phase	Final Approach
Route In Use	Vectors
Flight Plan	IFR
Component
Aircraft Component	Electrical Distribution Busbar
Person 1
Function	Pilot Flying Single Pilot
Qualification	Flight Crew Instrument Flight Crew Private
Experience	Flight Crew Last 90 Days 121 Flight Crew Total 172 Flight Crew Type 172
Events
Anomaly	Aircraft Equipment Problem Less Severe

Narrative:

After given vectors to intercept the ILS/localizer on final approach; low bus light indicator came on. Initiated checklist in anticipation of electrical failure. A minute or two after low bus light indicator came on; pdf and mfd malfunction occurred by showing red X's on the screens; then the GPS system shut down. We were able to squawk 7700 before completely losing all electrical components. I was able to hear the tower and complied with their instructions. I am not sure they could receive any transmission from the aircraft. I tried to let the tower know I could hear them by pressing 'ident'. I was given 'clear to land' clearance and proceeded to land the aircraft under VMC. We were met by an emergency response team after cleared off the runway and explained to them that we had no electrical components; therefore; couldn't communicate with the tower. They escorted us to FBO where mechanic look at the aircraft and concluded that the ring on the terminal bus broke; causing the issue.

Original NASA ASRS Text

Title: PA-28 pilot reported landing safely after experiencing loss of electrical power.

Narrative: After given vectors to intercept the ILS/LOC on final approach; Low Bus light indicator came ON. Initiated checklist in anticipation of electrical failure. A minute or two after Low Bus light indicator came ON; PDF and MFD malfunction occurred by showing Red X's on the screens; then the GPS system shut down. We were able to squawk 7700 before completely losing all electrical components. I was able to hear the Tower and complied with their instructions. I am not sure they could receive any transmission from the aircraft. I tried to let the Tower know I could hear them by pressing 'Ident'. I was given 'clear to land' clearance and proceeded to land the aircraft under VMC. We were met by an emergency response team after cleared off the runway and explained to them that we had no electrical components; therefore; couldn't communicate with the Tower. They escorted us to FBO where mechanic look at the aircraft and concluded that the ring on the Terminal Bus broke; causing the issue.

Data retrieved from NASA's ASRS site and automatically converted to unabbreviated mixed upper/lowercase text. This report is for informational purposes with no guarantee of accuracy. See NASA's ASRS site for official report.