Description
New product. Original MEDER LI12-BV14072 reed relay, E7/8 marking, a component from the previous MEDER generation used in specific insulation resistance monitoring (RISO) circuits of Aurora Power-One / ABB / FIMER photovoltaic inverters from 3 kW to 12.5 kW. The LI12-BV14072 code is identified in real applications on the RISO circuit of Aurora/ABB inverters; the corresponding MEDER LI series relay is the LI12-1A85, with a 12 V DC coil and high-insulation reed contact.
⚙️ Technical Specifications
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Brand: MEDER
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Original code: LI12-BV14072
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Marking: E7/8
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Type: SPST-NO (1 Form A) reed relay
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Coil: 12 V DC
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Coil resistance: 680 Ω
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Coil current: approx. 17.5 mA
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Contact current: 1 A
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Switching voltage: up to 1000 V AC / 1000 V DC
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Switching power: 100 W
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Mounting: PCB / solder terminals
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Housing: hermetically sealed
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Operate time: approx. 1 ms
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Release time: approx. 0.1 ms
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Operating temperature: −20…+70 °C
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LI12 model dimensions: approx. 30 × 10 × 10.4 mm
⚡ Function in the Electrical System
The LI12-BV14072 functions as a switching relay within the inverter's insulation measurement and monitoring circuit. In particular, it is associated with the RISO circuit, which checks the correct insulation resistance of the photovoltaic generator to earth before operation is enabled.
A failure of this specific relay has been documented on Aurora/ABB inverters with the appearance of the RISO LOW fault; in one real case, replacement of the original MEDER LI12-BV14072 relay resolved the problem.
🌐 Applications
The component is used as a replacement for specific electronic boards in Aurora Power-One, ABB, and FIMER inverters, including equipment within the power range indicated by the original circuit. Compatibility must nevertheless be verified according to the exact inverter model and board revision, without relying solely on the nominal power rating.
🛡️ Safety and Product Condition
The component is NEW, never used, with body and terminals intact as shown in the photographs. As it is intended for circuits with high insulation voltage, it must be replaced while exactly respecting the pinout, coil voltage, and characteristics of the original relay. It must not be considered a standard power relay.
📦 Package Contents
- 1 × MEDER LI12-BV14072
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New original component, as shown in the photographs.
🚀 Final Description
MEDER LI12-BV14072 is an original 12 V DC high-insulation reed relay, from the previous MEDER generation, identified by the LI12-BV14072 / E7/8 marking. It is a specific component for electronic RISO control circuits, particularly sought after as a replacement for certain Aurora Power-One, ABB, and FIMER inverters. The corresponding LI12-1A85 from the LI series confirms the characteristics of a 12 V DC coil, 680 Ω, SPST-NO contact, 1 A, and switching up to 1000 V AC/DC.
