Features
NT
S
CO
M
PL
Applications
Used as a secondary overcurrent protection
device in:
■
Customer Premise Equipment (CPE)
■
Central Office (CO)
■
Access equipment
■
■
■
■
Four resistance-matched PTCs in a
ceramic housing
Aids compliance with:
- ITU-T K.20/21/45
- Telcordia GR-1089-CORE
- UL 60950, 3rd Ed.
Narrow resistance tolerance
RoHS compliant*
*R
oH
IA
CMF-RQ Series - Telecom CPTC Resettable Fuses
Electrical Characteristics
Time
to Trip
@ Imax/
230 VAC
Model
Induction
Voltage
Withstand
Rated
Voltage
Rated
Resistance
(RN)
Resistance
Matching
In Housing
Hold
Current
Amps
@ 25 °C
Hold
Current
Amps
@ 40 °C
Trip
Current
Amps
@ 25 °C
Imax @
230 VAC
VAC
Volts
Ohms
Tolerance
Ohms
Amps
Seconds
CMF-RQ50
CMF-RQ50-10
600
600
230
230
50
50
±20 %
±10 %
± 0.5
± 0.5
0.09
0.09
0.06
0.06
0.19
0.19
3.0
3.0
< 0.1
< 0.1
Test Procedures And Requirements For Model CMF-RQ Series
Primary
Test
Protection
Test Condition
Requirements
Mains Power Contact - ITU-T K.20, K.21 ....None................230 V rms, 10 ohms, 15 Min. ......................................................(Ri-Rf) / Ri < ±10 %
Power Induction - ITU-T K.20, K.21..............None................600V rms, 600 ohms, 0.2 seconds, 10 cycles, every 1 Min. ......(Ri-Rf) / Ri < ±10 %
Power Induction - ITU-T K.20, K.21..............GDT ................600 V rms, 600 ohms, 1 second, 10 cycles, every 1 Min. ..........(Ri-Rf) / Ri < ±10 %
Power Induction - ITU-T K.20, K.21..............GDT ................600 V rms, 200 ohms, 1 second, 10 cycles, every 1 Min. ..........(Ri-Rf) / Ri < ±10 %
Lightning Surge - ITU-T K.20, K.21 ......................................10/700
µs,
25 ohms, 1.0 kV, 10 Tests, every 1 Min. ..................(Ri-Rf) / Ri < ±10 %
Lightning Surge......................................................................10/1000
µs,
40 ohms, 1.0 kV, 30 Tests, every 3 Min. ................(Ri-Rf) / Ri < ±10 %
Overvoltage Withstand ..........................................................300 V, 3 A, 4 Hours, 1 Time ........................................................(Ri-Rf) / Ri < ±10 %
Failure Mode ..........................................................................300 V, RL=0, 60 Min. ..................................................................**
Ri = R initial
Rf = R final
** Circuit disconnected or high resistance is acceptable.
Product Dimensions
SIDE
9.0 ± 1.0
(.354 ± .039)
FRONT
20.0 ± 1.0
(.787 ± .039)
1 3 5 7 = FRONT PINS
10.0 ± 1.0
(.394 ± .039)
2 4 6 8 = BACK PINS
1.5
(.059)
1
2
3
4
5
6
7
8
DIMENSIONS =
0.6
(.236)
1.2
(.047)
2.0
(.079)
MM
(INCHES)
BOTTOM
PINS 1 & 2 = 1ST CPTC
5.0 ± 0.2
(.197 ± .008)
9.0 ± 1.0
(.354 ± .039)
PINS 3 & 4 = 2ND CPTC
PINS 5 & 6 = 3RD CPTC
PINS 7 & 8 = 4TH CPTC
2.5 ± 0.1
(.098 ± .039)
5.0 ± 0.2
(.197 ± .008)
Packaging options:
BULK: 56 pcs. per plastic box
*RoHS Directive 2002/95/EC Jan 27 2003 including Annex.
Specifications are subject to change without notice.
Customers should verify actual device performance in their specific applications.
CMF-RQ Series - Telecom CPTC Resettable Fuses
Typical Part Marking
Represents total content. Layout may vary.
MANUFACTURER'S
TRADEMARK
QUAD
CERAMIC
CASE
PART
IDENTIFICATION:
50M = CMF-RQ50
50K = CMF-RQ50-10
C450M7G
BI-WEEKLY
DATE CODE:
WEEK 13-14 = G
YEAR CODE:
7 = 2007
How to Order
CMF - RQ 50 - 10 - 0
Product Designator
Style
RQ = Radial Quad Package
Rated Resistance (RN)
50 (50 Ohms)
Rated Resistance Tolerance
-10 = ±10 %
Blank = ±20 % (Standard)
Packaging Options
- 0 = Bulk Packaging
Reliable Electronic Solutions
Asia-Pacific:
Tel: +886-2 2562-4117 • Fax: +886-2 2562-4116
Europe:
Tel: +41-41 768 5555 • Fax: +41-41 768 5510
The Americas:
Tel: +1-951 781-5500 • Fax: +1-951 781-5700
www.bourns.com
CMF-RQ SERIES, REV. B, 11/07
COPYRIGHT' 2007, BOURNS, INC. LITHO IN U.S.A., MF0725 08/07
Specifications are subject to change without notice.
Customers should verify actual device performance in their specific applications.
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