Hot Tub control system circuit board fuse.
Product Notes: Used on Balboa BP100 & others. Keep a spare fuse on hand.
Amperage: 100mA (0.1A)
Type: Time Delay (Slow Blow)
Dimensions: 5mm x 20mm
Max Voltage: 250VAC
Reference: Balboa 24514, 35-0041A-K, GDC-100MA