PolySwitch®
PTC Devices
Overcurrent Protection Device
PRODUCT: TRF250-120U
DOCUMENT: SCD26217
REV LETTER: F
REV DATE: JULY 26, 2016
PAGE NO.: 1 OF 2
Specification Status: Released
Operating Conditions at 20°C:
Maximum Continuous Operating Voltage
(V
MCO
): 60V
DC
Maximum Interrupt Current (I
INT
): 3A
RMS
Fault Ratings at 20°C:
250V
RMS
, 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:
TABLE I. DIMENSIONS:
A
MIN
MAX
mm:
--
6.0
in:*
--
(0.24)
B
MIN
--
--
MAX
10.0
(0.39)
MIN
--
--
C
MAX
3.8
(0.15)
MIN
4.7
(0.19)
D
MAX
--
--
E
NOM
5.0
(0.20)
F
MIN
--
--
MAX
6.0
(0.24)
*
Rounded off approximation
TABLE II. PERFORMANCE RATINGS @ 20°C:
HOLD
TRIP
RESISTANCE (Ω)
TIME TO TRIP(Sec)
CURRE CURRENT
@ 1A
NT (A)
(A)
R MIN R MAX R
1 MAX
*
TYP
0.120
0.240
6.0
10.0
16.0
1.0
*Maximum device resistance at 20°C measured after 1 hour post trip
TABLE III. APPLICABLE PART DESCRIPTIONS:
PART DESCRIPTION
TRF250-120U
TRF250-120U-2
PACKAGING TYPE
Bulk
Bulk
OPERATING
TEMPERATURE
(°C)
MIN
MAX
-40
85
TRIPPED
POWER DISSIPATION
(W) 60V
DC**
TYP
MAX
0.7
0.8
NOTES
N/A
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
© 2016 Littelfuse,Inc.
Specifications are subject to change without notice.
Revised July 26,2016
littelfuse.com
PolySwitch®
PTC Devices
Overcurrent Protection Device
PRODUCT: TRF250-120U
DOCUMENT: SCD26217
REV LETTER: F
REV DATE: JULY 26, 2016
PAGE NO.: 2 OF 2
Information furnished is believed to be accurate and reliable. However, users should independently evaluate the suitability of and test each product selected for their
own applications. Littelfuse products are not designed for, and shall not be used for, any purpose (including, without limitation, military, aerospace, medical, lifesaving,
life-sustaining or nuclear facility applications, devices intended for surgical implant into the body, or any other application in which the failure or lack of desired
operation of the product may result in personal injury, death, or property damage) other than those expressly set forth in applicable Littelfuse product documentation
Warranties granted by Littelfuse shall be deemed void for products used for any purpose not expressly set forth in applicable Littelfuse documentation.
Littelfuse shallnot be liable for any claims or damages arising out of products used in applications not expressly intended by Littelfuse as set forth in applicable Littelfuse
documentation The sale and use of Littelfuse products is subject to Littelfuse Terms and Conditions of Sale, unless otherwise agreed by Littelfuse.
© 2016 Littelfuse,Inc.
Specifications are subject to change without notice.
Revised July 26,2016
littelfuse.com
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