unde - vari
- under frequency load shedding
- under frequency protection
- under frequency relay
- under plaster insulation
- under voltage
- under voltage protection
- under voltage tripping
- underbunching
- undercoat
- undercommutation
- undercompensation
- undercompound excitation
- undercooling
- undercurrent
- undercurrent circuit breaker
- undercurrent protection
- undercurrent relay
- undercut
- undercut profile
- underdamping
- underdevelopment
- underetch
- underexcitation
- underground antenna
- underground cable
- underground cable line
- underground conduit
- underground hydroelectric power station
- underground line
- underground railway
- underground substation
- underground system
- underlayer
- underload relay
- underloading
- underpower protection
- underpower relay
- undersaturated exciter
- undershoot
- underspeed
