◆ UBF SR Series - 125°C　Activation
 
◆Electrical Characteristics
 

Part No		Figure	lhold (A)	Itrip (A)	Vmax (V)	Imax (A)	Pd typ (W)	Max. (A)	Time-to-trip  (s)	R min (Ω)	R Max (Ω)	R1 Max  (Ω)
UBF	SR120	1	1.20	2.7	15	100	1.2	6.0	5.0	0.085	0.160	0.220
UBF	SR175	1	1.75	3.8	15	100	1.5	8.75	5.0	0.050	0.090	0.120
UBF	SR200	1	2.00	4.4	30	100	1.9	10.0	4.0	0.030	0.060	0.100
UBF	SR350	1	3.50	6.3	30	100	2.5	20.0	3.0	0.017	0.031	0.050
UBF	SR420	1	4.20	7.6	30	100	2.9	20.0	6.0	0.012	0.024	0.040

 
 
◆Comment
 

Ihold	Hold current is the maximum current that UB Fuse can pass through without interruption at 20°C unless otherwise specified.
Itrip	Trip current is the minimum current that will switch the device from low resistance state to high resistance state at 20°C unless specified.
Vmax	The maximum voltage device can withstand without damage at rated current.
Imax	The maximum current device can withstand without damage at rated voltage.
Pd	The power dissipated from device when in the tripped state at 20°C unless otherwise specified.
R min	The minimum resistance of device as received from the factory at 20°C unless otherwise specified.
R max	The maximum resistance of device as received from the factory at 20°C unless otherwise specified.
R1max	The maximum resistance of device when measured one hour post trip at 20°C unless otherwise specified.
Max. Time-to-trip	The maximum time for device to trip at specified current ratings at 20°C unless otherwise specified.

 
 
◆ Environmental Characteristics
 

Test	Test Conditions	Resistance Change
Passive Aging	+70°C, 1000 hours	±10% typical resistance change
Humidity Aging	+85°C, 85% R.H., 7 days	±10% typical resistance change
Thermal Shock	+85°C to -40°C, 10 times MIL-STD-202, Method 107G	±+5% typical resistance change
Vibration	MIL-STD-883C, Condition A	No change

 
 
◆Dimensions
 

	A		B		C		D		E		F
Part No	Min.	Max.	Min.	Max.	Min.	Max.	Min.	Max.	Min.	Max.	Min.	Max.
UBF　SR120	19.9	22.1	0.6	1.0	4.9	5.2	5.5	7.5	5.5	7.5	3.9	4.1
UBF　SR120S	19.9	22.1	0.6	1.0	4.9	5.2	5.5	7.5	5.5	7.5	3.9	4.1
UBF　SR175	20.9	23.1	0.6	1.0	4.9	5.2	4.1	5.5	4.1	5.5	3.9	4.1
UBF　SR175S	20.9	23.1	0.6	1.0	4.9	5.2	4.1	5.5	4.1	5.5	3.9	4.1
UBF　SR175SS	20.9	23.1	0.6	1.0	4.9	5.2	4.1	5.5	4.1	5.5	3.9	4.1
UBF　SR175N	26.0	28.0	0.6	1.0	3.55	3.80	7.1	8.5	7.1	8.5	2.4	2.6
UBF　SR200	21.3	23.4	0.5	1.1	10.2	11.0	5.0	7.6	5.0	7.6	4.8	5.4
UBF　SR200N	30.0	32.0	0.6	1.0	3.55	3.80	5.5	7.5	5.5	7.5	2.4	2.6
UBF　SR350	28.4	31.8	0.5	1.1	13.0	13.5	6.3	8.9	6.3	8.9	6.0	6.6
UBF　SR420	30.6	32.4	0.5	1.1	12.9	13.6	5.0	7.5	5.0	7.5	6.0	6.7

 
 
●NOTE:

All drawings are not in scale and layout may vary.
All parts dimension is in millimeter unless otherwise specified.
Terminal material is quarter hard Nickel with nominal thickness 0.125mm.
Tape material is Polyester.
All terminal’s slit dimension is 0.5x4.0mm.
Rounded corner terminals are available upon customer request.
All part numbers are available without wrapping upon customer request.                     
 

●Packaging: 1000 pcs per bag (UBFSR120 to UBFSR175N,200N)
            500 pcs per bag (UBFSR200 to UBFSR420)
 
●Agency Approval:
 

UL File Number	E 119550
TUV File Number	Pending

 
 
◆Typical Thermal Derating Chart - Ihold (A)
 

Part No	-40	-20	0	25	40	60	85
UBF　SR120	1.9	1.7	1.5	1.2	1.0	0.8	0.4
UBF　SR120S	1.9	1.7	1.5	1.2	1.0	0.8	0.4
UBF　SR175	2.5	2.2	2.0	1.75	1.4	1.2	0.8
UBF　SR175S	2.5	2.2	2.0	1.75	1.4	1.2	0.8
UBF　SR175SS	2.5	2.2	2.0	1.75	1.4	1.2	0.8
UBF　SR175N	2.5	2.2	2.0	1.75	1.4	1.2	0.8
UBF　SR200	3.1	2.8	2.5	2.0	1.7	1.4	0.9
UBF　SR200N	3.1	2.8	2.5	2.0	1.7	1.4	0.9
UBF　SR350	5.3	4.8	4.3	3.5	3.0	2.5	1.7
UBF　SR420	6.3	5.7	5.1	4.2	3.6	3.0	2.1

 
 




 
◆Typical Time To Trip Curve at 20°C