Unit type earth leakage relay LU-4A
Hikari Shoko Co., Ltd.
About This Product
■JIS C 8374 earth leakage relay compliant product
- Only the unit part of the relay is compacted and has a plug-in structure, so you can freely design combinations of output contacts such as alarm, cutoff, display, etc. Also, the mounting direction is free.
- External dimensions are the same as LU-2A/2B and LU-3A/3B. In addition, they are compatible, so you can use existing terminal boards.
・It is a harmonic countermeasure product.
- Environmentally friendly product (RoHS Directive compliant).
■Operation
LU-4A/4B protects low-voltage distribution lines from leakage and is used in combination with a zero-phase current transformer. If a ground fault occurs in the load-side electrical circuit after the zero-phase current transformer is installed, an electromotive force will be generated at the secondary terminal of the zero-phase current transformer. After adjusting the sensitivity of this secondary output, it is amplified by an amplifier, its magnitude is determined by a level detection circuit, and then the output contact is operated by a switching circuit.
When using the LU-4A/4B with the manual reset method, the output contact will not reset until the reset pushbutton switch provided in the control power circuit is pressed. For automatic return type models, the output contact will return to normal when the leakage is eliminated.
■Features
・Protects low-voltage circuit equipment from electrical leakage.
・Only the unit part has been summarized into a plug-in structure.
・Special terminal block CF-51 is required.
- Since the specifications differ for the same model, please specify the return method and rated control power supply voltage when ordering.
・It is a harmonic countermeasure product.
・Compliant with "JIS C 8374 Earth Leakage Relay".
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Product
Unit type earth leakage relay LU-4A
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Handling Company
Hikari Shoko Co., Ltd.
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Categories
1 Models of Unit type earth leakage relay LU-4A
| Product Image | Part Number | Price (excluding tax) | Control power supply voltage | Exterior color | Frequency | Heavy ground fault capacity | Insulation resistance | Mass | Non-operating current | Operating temperature range | Operating time | Output contact configuration | Output contact return method | Output contact switching capacity 1 | Output contact switching capacity 2 | Power consumption | Sensitivity current setting value | Sensitivity current tolerance range | Test method | Withstand voltage 1 | Withstand voltage 2 | Working voltage range |
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LU-4A |
Available upon quote | AC100/110V or AC200/220V | Munsell symbol N1.5 | 50/60Hz | Continuous AC600A, max. 5,000A, 0.3s | 20MΩ or more at DC500V megger (withstand voltage applied point) | Approximately 0.2kg | 50% of sensitivity current setting value | -20℃~+50℃ | Within 0.15s (100% signal applied) | 3a | Manual return method (by external switch) or automatic return method |
AC110V 2A cosφ=1 0.7A cosφ=0.4 AC200V 0.7A cosφ=1 0.2A cosφ=0.4 |
DC24V 2A L/R=1ms 1A L/R=7ms DC100V 0.35A L/R=1ms 0.15A L/R=7ms |
Constantly 4VA (at 110V AC), 2VA (at 220V AC) Operating 4VA (at 110V AC), 2VA (at 220V AC) |
0.07-0.2-0.4 (A) Internal tap switching | 51~100% | Test switch (inside test hole) |
AC1,500V for 1 minute Between control circuit conductive part and outer box AC1,500V for 1 minute between all control power terminals and control circuit conductive parts |
AC1,000V for 1 minute between control circuit conductive parts AC500V for 1 minute between open contacts of the same control circuit |
AC80~121V or AC160~242V |
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About Company Handling This Product
- Japan