NR Series Breaker (Thermal Cutoff Device)
* RoHS Directive 2002/95/EC Jan. 27, 2003 including annex and RoHS Recast 2011/65/EU June 8, 2011.
** Bourns considers a product to be “halogen free” if (a) the Bromine (Br) content is 900 ppm or less; (b) the Chlorine (Cl) content is 900 ppm or less; and (c) the total Bromine (Br)
and Chlorine (Cl) content is 1500 ppm or less.
Specifications are subject to change without notice. Users should verify actual device performance in their specific applications.
The products described herein and this document are subject to specific legal disclaimers as set forth on the last page of this document, and at www.bourns.com/docs/legal/disclaimer.pdf.
™
Features
n Formerly a product
n Miniature Thermal Cutoff (TCO) device
n Smallest body size, two current types
n Overtemperature and overcurrent protection
for lithium polymer and prismatic cells
n Controls abnormal, excessive current
virtually instantaneously
n Wide range of temperature options
Applications
Battery cell protection for:
n Notebook PCs
n Tablet PCs
n Smart phones
n Mobile phones
Ratings
Specication
A-TYPE
NR72AB0 NR77AB0 NR82AB0 NR85AB0
Trip Temperature 72 °C ± 5 °C 77 °C ± 5 °C 82 °C ± 5 °C 85 °C ± 5 °C
Reset Temperature 40 °C min.
Contact Rating DC12V / 25 A, 6000 cycles
Maximum Breaking Current DC5V / 60 A, 100 cycles
Maximum Voltage DC28V / 25 A, 100 cycles
Minimum Holding Voltage 2 V @ 25 °C for 1 minute
Maximum Leakage Current 200 mA max. @ 25 °C
Resistance 5 milliohms max.
Agency Recognition
Product Dimensions
Description
UL, cUL File Number: E215638
TUV File Number: R50281578
Product Structure
4.8 ± 0.1
(.189 ± .004)
3.2 ± 0.1
(.126 ± .004)
3.2 ± 0.1
(.126 ± .004)
2.0 ± 0.1
(.079 ± .004)
2.0 ± 0.1
(.079 ± .004)
2.8 ± 0.1
(.110 ± .004)
0.89 ± 0.05
(.035 ± .002)
0.1 ± 0.01
(.004 ± .0004)
DIMENSIONS:
MM
(INCHES)
How to Order
NR 77 A B 0
Series Designator
Trip Temperature (±5 °C)
• 72 • 82
• 77 • 85
Arm Material
A = Cu Alloy High Current Type
C = Cu Alloy Low Current Type
Terminal Type
1 = With Projection
B = No Projection
Manufacturer’s Internal Code
ARM TERMINAL
COVER PLATE
CONTACT
COVER
ARM
BASE TERMINAL
BASE
AVAILABLE WITH AND WITHOUT PROJECTIONS.
PROJECTION
BIMETAL DISC
PTC
PROJECTION
Specication
C-TYPE
NR72CB0 NR77CB0 NR82CB0 NR85CB0
Trip Temperature 72 °C ± 5 °C 77 °C ± 5 °C 82 °C ± 5 °C 85 °C ± 5 °C
Reset Temperature 40 °C min.
Contact Rating DC12V / 12 A, 6000 cycles
Maximum Breaking Current DC5V / 30 A, 100 cycles
Maximum Voltage DC28V / 12 A, 100 cycles
Minimum Holding Voltage 2 V @ 25 °C for 1 minute
Maximum Leakage Current 150 mA max. @ 25 °C
Resistance 15 milliohms max.
Mini-breaker TCOs reset when the following conditions are met:
• The ambient temperature has dropped by 10 °C below the minimum trip temperature
• Power to the TCO has been cycled (off/on)
1 1 5 5 C
N R 7 2 A B 0
5 6
1 2 1 5 C
N R 7 7 C B 0
6 7
*RoHS COMPLIANT
LEAD FREE
*RoHS COMPLIANT
&
**HALOGEN FREE
LEAD FREE
VERSIONS ARE
RoHS COMPLIANT*
Specifications are subject to change without notice.
Users should verify actual device performance in their specific applications.
The products described herein and this document are subject to specific legal disclaimers as set forth on the last page of this document, and at www.bourns.com/docs/legal/disclaimer.pdf.
NR Series Breaker (Thermal Cutoff Device)
Typical Performance
Operation
Temperature (°C)
Current (A)
0
1
2
3
4
5
6
7
8
9
10
11
12
13
14
15
16
17
18
19
20
20 30 40 50 60 70 80
NR72AB0 (Low 67 °C average)
NR77AB0 (Low 72 °C average)
NR82AB0 (Low 77 °C average)
NR85AB0 (Low 80 °C average)
The above curves were derived from placing test samples in an oven at 25 ℃, 40 ℃, 60 ℃ and 70℃, increasing current ow through the
sample at a rate of 0.1 A/minute and recording the current value when the sample trips.
Current vs. Temperature Curves
A-Type
NORMAL CIRCUIT
CIRCUIT
AFTER OPENING
CURRENT
EXCESSIVE
CURRENT
AND/OR
HEAT
VERY LOW CURRENT
Ambient Temperature (°C)
Current (A)
9
10
20 30 40 50 7060 80
8
7
6
5
4
3
2
1
0
NR72CB0 (Low 67 °C average)
NR77CB0 (Low 72 °C average)
NR82CB0 (Low 77 °C average)
NR85CB0 (Low 80 °C average)
Current vs. Temperature Curves
C-Type