PolySwitch®
PTC Devices
Overcurrent Protection Device
PRODUCT: TRF250-120U
DOCUMENT: SCD26217
REV LETTER: F
REV DATE: JULY 26, 2016
PAGE NO.: 1 OF 2
© 2016 Littelfuse,Inc. littelfuse.com
Specifications are subject to change without notice.
Revised July 26,2016
Specification Status: Released
TABLE I. DIMENSIONS:
A
B
C
E
F
MIN
MAX
MIN
MAX
MIN
MAX
MIN
MAX
NOM
MIN
MAX
mm:
--
6.0
--
10.0
--
3.8
4.7
--
5.0
--
6.0
in:*
--
(0.24)
--
(0.39)
--
(0.15)
(0.19)
--
(0.20)
--
(0.24)
*Rounded off approximation
TABLE II. PERFORMANCE RATINGS @ 20°C:
HOLD
CURRE
NT (A)
TRIP
CURRENT
(A)
RESISTANCE (Ω)
TIME TO TRIP(Sec)
@ 1A
OPERATING
TEMPERATURE
(°C)
TRIPPED
POWER DISSIPATION
(W) 60VDC**
R MIN
R MAX
R1 MAX*
TYP
MIN
MAX
TYP
MAX
0.120
0.240
6.0
10.0
16.0
1.0
-40
85
0.7
0.8
*Maximum device resistance at 20°C measured after 1 hour post trip
TABLE III. APPLICABLE PART DESCRIPTIONS:
PART DESCRIPTION
PACKAGING TYPE
NOTES
TRF250-120U
Bulk
N/A
TRF250-120U-2
Bulk
N/A
Agency Recognitions: UL (File #E74889), CSA (File #78165C), TUV
Reference Documents: PS300, ITU-T K.20
Precedence: This specification takes precedence over documents referenced herein.
Effectivity: Reference documents shall be the issue in effect on the date of invitation for bid.
CAUTION:Operation beyond the rated voltage or current may result in rupture, electrical arcing or flame.
Materials Information
ROHS Compliant ELV Compliant Pb-Free
Operating Conditions at 20°C:
Maximum Continuous Operating Voltage
(VMCO): 60VDC
Maximum Interrupt Current (IINT ): 3ARMS
Fault Ratings at 20°C:
250VRMS, 3A, 10 applications
Additional Info at 20°C:
Resistance matched: n/a
Lightning withstand: 1.5kV per ITU-T K.20
Helps equipment meet ITU-T K.20
Recommendations
Helps equipment meet Telcordia GR1089
intrabuilding requirements
Lead Material:
22 AWG Sn-Plated Copper (0.64 mm [0.025”]
nominal diameter)
Marking:
PolySwitch®
PTC Devices
Overcurrent Protection Device
PRODUCT: TRF250-120U
DOCUMENT: SCD26217
REV LETTER: F
REV DATE: JULY 26, 2016
PAGE NO.: 2 OF 2
© 2016 Littelfuse,Inc. littelfuse.com
Specifications are subject to change without notice.
Revised July 26,2016
Information furnished is believed to be accurate and reliable. However, users should independently evaluate the suitability of and test each product selected for their
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