FUSIBLE RESISTOR
Non-flame coating, raw materials used for fusible resis tors are that of metal film resistors Ideal circuit opening controller, disconnecting units from overload rating specified Too low or too high ohmic value can be supplied on a case-to-case basis
Explanation of Part Number & Ordering Procedure:
B
Resistor Type:
Coated Resistors
Power Rating:
W4 ~ 1/4W W2 ~ 1/2W 1W ~ 1W 2W ~ 2W 3W ~ 3W
Resistance Value: E-6, E-12, E-24 series
a.) Normally for these series, the box No. 6 is 0. b.) Boxes No. 7 & 8 are for the Ohmic Value. c.) Box No. 9 is for the multiplier or indication for no. of zeros. E-96 series a.) Boxes No. 6 to 8 are for the Ohmic Value. b.) Box No. 9 is for the multiplier or indication for no. of zeros. Decimal point is expressed by: J- 0.1, K- 0.01, L- 0.001 Ex. 226 ~ 226K, 226 ~ 2260
Series Code:
F ~ Fusible Resistor
Tolerance:
F = 1%, G = 2%, J = 5%, K = 10%
Note:
Special T.C.R. requirements can be supplied on a case-to-case basis. Please indicate when ordering.
Packing Type:
A = Tape / Box B = Bulk / Box T = Tape / Reel
Suffix for Special Features:
F ~ F Type, M ~ M Type, T ~ T Type 0 ~ PT-52 mm, 1 ~ PT-26 mm, 8 ~ PT-58 mm, 9 ~ PT-64 mm
Assistance Code:
Usually is 0 As: F(3) Type = 3
* Color code is the same as 1%
Page 30
2004 - 2005
FUSIBLE RESISTOR
Part No.
BFW4 BFW2 BF1W BF2W BF3W
Style
FRN-25 FRN-50 FRN-100 FRN-200 FRN-300
Power Rating at 70C
1/4W (0.25W) 1/2W (0.5W) 1W 2W 3W
+0.02 D Max.
2.5 3.0 4.0 5.0 5.5
L Max.
6.8 9.0 10.0 12.0 16.0
H3
28 28 28 28 28
d -0.05
0.6 0.6 0.8 0.8 0.8
Resistance Range
0.22 ~ 10K 0.22 ~ 10K 0.3 ~ 10K 0.3 ~ 10K 0.3 ~ 10K
Dielectric Withstanding Voltage
300V 350V 350V 600V 600V
Fusing Characteristics
Resistance Range
0.22 ~ 0.99
Magnification of Power Rating
32 16 20
Fusing Time (Maximum time)
60 Sec. 60 Sec. 40 Sec. 30 Sec. 20 Sec. 15 Sec.
1 ~ 10K
24 28 32
Derating Curve
Overload Curve
Fusing Characteristics Chart
2004 - 2005
Page 31
FUSIBLE RESISTOR
Performance Specifications:
Characteristics Test Methods
Natural resistance change per temp. degree centigrade R2 R1 Temperature coefficient JIS C 5202 5.2 x 106 (PPM / C) R1 (t2-t1) R1 : Resistance value at room temperature (t1) R2 : Resistance value at room temp. plus 100C (t2) Permanent resistance change after the application of a potential of 2.5 times RCWV or the max. overload voltage respectively specified in the above list, whichever less for 5 seconds. Resistance change rate is (2% + 0.05) No evidence of mechanical damage 350PPM / C
Limits
Short time overload JIS C 5202 5.5
Dielectric withstanding voltage JIS C 5202 5.7
Resistors shall be clamped in the trough of a 90 metallic V- block and shall be tested at AC potential respectively specified in the above list for 60 + 10 / -0 seconds. Direct load: Resistance to a 2.5 kgs. direct load for 10 seconds in the
No evidence of flashover mechanical damage, arcing or insulation break down.
Terminal strength JIS C 5202 6.1
direction of the longitudinal axis of the terminal leads. Twist test: Terminal leads shall be bent through 90 at a point of about 6mm from the body of the resistor and shall be rotated through 360 about the original axis of the bent terminal in alternating direction for a total of 3 rotations.
No evidence of mechanical damage.
Resistance to Soldering Heat JIS C 5202 6.4
Permanent resistance change when leads immersed to 3.2 mm to 4.8 mm from the body in 350C 10C solder for 3 0.5 seconds
Resistance change rate is ( 1.0%+0.05 ) No evidence of mechanical damage.
The area covered with a new, smooth, clean, shiny and continuous Solderability JIS C 5202 6.5 surface free from concentrated pinholes. Test temp. of solder: 235C 5C Dwell time in solder: 3 +0.5/ -0 seconds Resistance change after continuous five cycles for duty cycle specified below: Step Temperature cycling JIS C 5202 7.4 1 2 3 4 Temperature -55C3C Room temp. +155 C2 C Room temp. Time 30 mins. 10 15 mins. 30 mins. 10 15 mins. Resistance change rate is ( 2.0%+0.05 ) No evidence of mechanical damage. 95% coverage Min.
* RCWV = Rated Continuous Working Voltage = Rated Power x Resistance Value
Page 32
2004 - 2005
FUSIBLE RESISTOR
Performance Specifications:
Characteristics Test Methods
Resistance change after 1,000 hours (1.5 hours on, 0.5 hour off) at RCWV in a humidity test chamber controlled at 40C 2C and 90 to 95% relative humidity.
Limits
Resistance change rate is (5% + 0.05) No evidence of mechanical damage
Load life in humidity JIS - C - 5202 7.9
Load life JIS - C - 5202 7.10
Permanent resistance change after 1,000 hours operating at RCWV with duty cycle of (1.5 hours on, 0.5 hour off) at 70 C 2C ambient.
Resistance change rate is (5% + 0.05) No evidence of mechanical damage
Non-Flame JIS - C - 5202 7.12
The burner is placed remote from resistor ignited and adjusted to produce a blue flame 38mm in height and a top of flame 127mm above the top of burner tube. Resistor is supported from its lead at 45 degree from the hori- Do not have any specimen, which burn with flaming zontal so that the lower end of resistor is the top of blue flame. combustion after each application of the test flame. The test flame is placed to remain for 15 seconds and re moved for 15 seconds. The operation is to be repeated until resistor has been subjected to 5 application of test flame.
* RCWV = Rated Continuous Working Voltage = Rated Power x Resistance Value
2004 - 2005
Page 33
