Product Description TL Time Delay Plug Fuse Emergency Kit, Contains One 15A, Two 20A, Three 30A Fuses & A Fuse Tester, Dimensions: 0.83"L x 0.98"W x 0.36"H, In A Convenient Recloseable Clamshell. From the Manufacturer Medium-Duty Type TL fuses for residential motor circuits in kitchens, workshops, garages, utility rooms or any circuit with motors, relays or solenoids. This fuse threads into fuse receptacle. Threaded fuse type: Edison Base (brass threads). Not interchangeable with Rejection Base (porcelain threads) type. Medium-duty (TL) category plug fuse. The medium-duty fuse (TL) has a time-delay feature for use on motor circuits. Plug fuses are rated for a maximum of 125Vac. TL three pack (PK3) version (blister pack). Plug fuses are often used in residential and industrial branch circuit and motor protection. Fuses are used to protect furnace blower motors, pumps, power tools, garage door openers, etc. Motor protection fuses are usually used in conjunction with branch circuit protection. The fuse is often located in a box cover unit. Plug fuses provide a compact and inexpensive method to prevent damage to electrical motors. They help reduce downtime and lower maintenance costs by opening the circuit when a dangerous overload is present. When used for residential branch circuit protection, fuses are typically located in the main fuse panel.