参数资料
| 型号： | C1938 |
| 厂商： | Cooper Bussmann |
| 文件页数： | 21/40页 |
| 文件大小： | 0K |
| 描述： | JUNCTION BLOCK STUD BLK BASE |
| 标准包装： | 50 |
| 端接块类型： | 接线盒区块 |
| 电路数： | 1 |
| 导线入口数目： | 1 |
| 行数： | 1 |
| 电流： | 250A |
| 顶部端子： | 接线柱 |
| 底部端子： | 接线柱 |
| 阻挡层类型： | 开路 |
| 特点： | 3/8 接线柱 |
| 颜色： | 黑 |
| 包装： | 散装 |
| 安装类型： | 底座安装或面板安装 |
| 材料 - 绝缘体： | 热塑塑胶 |
| 其它名称： | 283-3908 C1938-ND |
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Basic Overcurrent Technology
relatively low and predictable melting point. Fuses are
current-sensitive devices and the resistance is so low that
they simply act as a conductor. Circuit protection is
provided when the fuse element melts and interrupts an
overcurrent. The key criteria used to judge the performance
of a fuse is the time-versus-current characteristic curve.
This curve can be used to match the fuse with the load.
Fuses may be preferred when fast response to a short
circuit condition is required or when high available short
circuit currents occur. Fuse characteristic curves can be
used to carefully size the device to a critical or special
application.
Thermal Circuit Breakers
The basic components of a thermal circuit breaker are the
thermal alloy element, electrical contacts, and the terminals
for external connections. When an overload occurs, heat is
generated as the current flows through the thermal alloy
element causing it to deflect and separate the electrical
contacts, interrupting current flow. An important parameter
used to judge the performance of a thermal circuit breaker
is the time-versus-current characteristic curve, which is
similar to that of a fuse. A thermal circuit breaker is
generally not a one-event type device as is a fuse. The
resettable features of circuit breakers are often found
attractive for use in electrical circuits where non-resetting
interruption of current flow is undesirable. It is important to
note that cycle life of a thermal circuit breaker is
impacted both by the operational characteristic of the
circuit breaker as well as the relative magnitude and
duration of overcurrents or short circuits that the
device experiences. There are different operational
characteristics of Cooper Bussmann thermal circuit
breakers, which are described below.
CIRCUIT BREAKER
OPERATIONAL CHARACTERISTICS
Four different methods for reset are generally available:
? Type I (automatic reset): the circuit breaker trips and
resets in response to the overcurrent condition in a
repetitive fashion. This version should be used in
applications that provide for other self-limiting or
non-resettable means (such as after a main fuse, main
manual-reset circuit breaker, or momentary switch).
These devices, while automatic in reset function, are
not designed for long-term cycling conditions in
applications where operator awareness of circuit fault
or serviceability access is limited, leading to
unsatisfactory failure events. Refer to SAE J553 or
J1625 for additional details.
? Type II (modified reset): the circuit breaker contains an
additional resistive component that enables the device to
have only brief trip and reset activity and then afterwards
maintains an open circuit condition (except for a low
milliamp draw through the resistor). Requires minimum
voltage/current to maintain open circuit - see standards for
details SAEJ553.
? Type III (manual reset): the circuit breaker will trip in
response to an overcurrent condition after which a reset
button or lever extends externally to indicate that the
breaker has tripped and is in a non-conducting state. The
trip indicator button or lever must be manually activated to
return the device to normal operation.
? Type III (switchable): same as the manual Type III
manual reset with the additional feature of allowing the
user to open the circuit using an externally accessible trip
mechanism.
CIRCUIT BREAKER APPLICATION NOTES
? Circuit Breaker Performance - Cooper Bussmann
thermal circuit breakers are designed to conform to
relevant industry standards (refer to individual models for
standard references). There are specific performance
aspects that may not always make circuit breakers
suitable for certain applications, especially in circuits
that are incapable of providing enough current to
operate the circuit breaker in a timely manner relative
to the associated components and wiring. It is of
utmost importance that the circuit designer investigates
components that have finite overload capabilities which
are below the time-current levels to initiate timely circuit
breaker activation.
? Evaluation - Design-in situations require that the user
considers all application conditions and conducts
operational testing to establish the correctness of
ampere/voltage rating as well as overload protection
suitability. Further review of industry standards is advised
to understand all performance aspects that affect usage.
? Wiring Considerations - Additional evaluation of circuit
conditions is essential to achieve proper matching of wire
sizes to the current load conditions anticipated under
normal operating conditions, and estimated abnormal
operating conditions when overloads could occur. Thermal
circuit breakers and fuses introduce some level of
resistance to the current path where installed. These
factors should also be considered when choosing wire,
both in gauge as well as in temperature rating
of insulation.
? Installation Environment - Thermal circuit breakers are
produced in various configurations. Installation
environmental conditions need to be considered and
compared to the capability of the particular product of
choice. Not all circuit breaker designs are suitable for
harsh conditions, such as may be encountered under-
hood or external cavities.
Cooper Bussmann Transportation Products ? Phone: 1-888-867-8194 ? Website: http://www.coopertp.com
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| C1938-1 | 功能描述:熔丝座 BLACK 5/16"STUD JB TIN PLATE RoHS:否 制造商:Littelfuse 产品: 电流额定值:30 A 电压额定值:1000 VDC 极数:1 系列: 安装风格:DIN Rail 端接类型: 轴类型: 工作温度范围: |
| C1938-1R | 功能描述:熔丝座 RED 5/16"STUD JB TIN PLATE RoHS:否 制造商:Littelfuse 产品: 电流额定值:30 A 电压额定值:1000 VDC 极数:1 系列: 安装风格:DIN Rail 端接类型: 轴类型: 工作温度范围: |
| C1938R | 功能描述:熔丝座 RED 3/8"STUD JB ZINC PLAT RoHS:否 制造商:Littelfuse 产品: 电流额定值:30 A 电压额定值:1000 VDC 极数:1 系列: 安装风格:DIN Rail 端接类型: 轴类型: 工作温度范围: |
| C194 | 制造商:Datak Corporation 功能描述:Cable Assembly RS-232 3.048m 28AWG 25 POS D-Sub to 25 POS D-Sub M-F |
| C1942P | 制造商:PERKINELMER 制造商全称:PerkinElmer Optoelectronics 功能描述:Channel Photomultipliers |
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