SIEMENS
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Siemens IC 10 · 2017
Overload Relays
SIRIUS 3RB3 Electronic Overload Relays
3RB30，3RB31用于标准申请
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Sirius 3RB3133-4.B0电子超载继电器
3RB30/3RB31电子超载中继最多115 a
内部电源是为当前遥控器设计的
dent protection of loads with normal and heavy starting, and to
protect against excessive temperature rises due to overload,
相不对称或相位故障。超负荷，相反 -
尝试或相位故障导致电动机电流增加
yond the set rated motor current. This current rise is detected by
当前集成到设备中的当前变压器并评估
ated by corresponding solid-state circuits which then output a
pulse to the auxiliary contacts. The auxiliary contacts then switch
off the load by means of a contactor. The break time depends on
the ratio between the tripping current and the current setting
I
e
and is stored in the form of a long-term stable tripping charac-
特性曲线，
(see Characteristic curves)
.
In addition to inverse-time delayed protection of loads against
excessive temperature rises due to overload, phase asymmetry
and phase failure, the 3RB31 electronic overload relays also
允许内部的故障检测（不可能结合使用
with contactor assemblies for wye-delta starting). This provides
protection of loads against high-resistance short circuits due to
损坏隔热材料，水分，冷凝水
etc.
“绊倒”状态通过开关位置发出信号
indicator. The relay is reset manually or automatically after the
恢复时间已经过去。
The 3RB3 electronic overload relays are suitable for operation
with frequency converters.
The devices are manufactured in accordance with environmen-
tal guidelines and contain environmentally friendly and reusable
materials. They comply with all important worldwide standards
和批准。
3RB20和3RB21尺寸S6至S10/S12的超载继电器，
see
page 7/109 onwards.
在危险区域使用
3RB30/3RB31电子超载继电器适合
overload protection of motors with the following types of
保护：
•
II (2) G [Ex e] [Ex d] [Ex px]
•
II (2) D [Ex t] [Ex p]
存在II组的EC类型测试证书，（2）g/d类。它
具有数字PTB 09 ATEX 3001。
8
5
6
7
1
4
3
2
可以选择安装可密封的透明盖
（配饰）。它可确保电动机电流设置不受调整。
连接到接触器上的连接：
Optimally adapted in electrical, mechanical and design terms to the
接触器3RT2。超载继电器可以直接连接
using these connection pins. Stand-alone installation is possible as
替代方案（结合终端支持
独立安装）。
8
用于手册/自动重置的选择器开关：
使用幻灯片开关，您可以在手动和自动之间进行选择
重置。
5
指示旅行并启用接线测试。
Switch position indicator and TEST function of the wiring:
1
固态测试（设备测试）：
启用所有重要设备组件和功能的测试。
3
Motor current setting:
Setting the device to the rated motor current is easy with the large
旋转旋钮。
6
旅行类设置/内部故障检测（仅3RB31）：
使用旋转开关，您可以设置所需的旅行类和
激活内部接地检测取决于
启动条件。
2
Connecting terminals (removable joint block for auxiliary circuits):
根据设备版本，螺钉和端子
为主和辅助配置了弹簧型连接
电路。
4
A device set to manual RESET can be reset locally by pressing the
复位按钮。在3RB31过载上，继电器
重置已集成。
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IC01_00406
©Siemens AG 2016