15
% of Opening Time
Rating Minimum Maximum
1000
100
10
1
0.1
0.01
100001000100101
TIME IN SECONDS
CURRENT IN AMPERES
30A20A 40A 50A 60A
JCASE
®
Cartridge Fuse
The JCASE is a cartridge style fuse with female terminal design, pro-
viding both increased time delay and low voltage drop to protect high
current circuits and handle inrush currents. The JCASE was designed
and patented by Littelfuse.
Typ. Voltage
Current Drop at
Part Rating Housing Rated Current
Number (A) Color (mV)
495020 20 Blue 106
495025 25 White 101
495030 30 Pink 91
495040 40 Green 87
495050 50 Red 88
495060 60 Yellow 87
27.0
18.7
14.1
24.4
12.0
10.0
1.0
6.7
5.5
12.1
JCASE Fuse Series Temperature Rerating Curve
Ambient Temperature (°C)
Rerating Factor (% Rated Current)
-40
85
90
95
100
105
110
-30 -20 -10 0 10 20 30 40 50 60 70 80 90 100 110 120
100 100 hrs —
135 60 s 1800 s
200 4 s 60 s
350 0.2 s 7 s
600 0.04 s 1 s
TIME-CURRENT CHARACTERISTICS
JCASE CARTRIDGE FUSE TABLE
Interrupting Rating: 1000A @ 32 VDC
Voltage Rating: 32 VDC
Insertion Force: 53N max. (12 lb.)
Extraction Force: 9N min. (2 lb.)
Ambient Temp: -40˚C to + 125˚C
See page 32 for
JCASE Shunt