Adhesives for PCB of PV Rapid Shutdown Devices: Zoned Protection Solution with COATING 9062 and SIPA 3015
For moisture-proof and insulation protection of the control PCB in module-level PV rapid shutdown devices, ELAPLUS COATING 9062 silicone conformal coating may be prioritised for evaluation. For enclosed fixed electronic cavities requiring deep filling, SIPA 3015 A/B two-part silicone potting compound can be further compared. These two materials are intended for thin-film circuit protection and designated cavity potting respectively. They are not direct substitutes for one another and must not impair the switching action, insulation structure or safety shutdown function of rapid shutdown devices. PV rapid shutdown devices are generally mounted near PV modules to achieve rapid disconnection of specified DC circuits in compliance with system control requirements. Internally they may house control PCBs, power switches, detection circuits, communication units and connection terminals; circuit architectures and shutdown mechanisms vary among product designs. Compared with indoor electronic control boards, module-level rapid shutdown devices are subject to wide ambient temperature swings, long-term outdoor operation and field maintenance constraints. Therefore, adhesive selection shall begin with clarification of electrical functions, component placement and structural boundaries before a conformal coating or local potting scheme is finalised. 1. Why PCB Protection Is Required for PV Rapid Shutdown Devices Module-level rapid shutdown devices reside for extended periods on or near the rear side of PV modules. Their operating environment exposes them to moisture, dust, thermal cycling and other contaminants. Contamination or insulation degradation on electronic traces may compromise control signals, sensing circuits and other electronic functions. A rapid shutdown device is far more than an ordinary low-voltage control module. Its DC side may sustain high voltages, while power components and connection terminals must satisfy relevant requirements for electrical clearance, insulation and temperature rise. Accordingly, PCB protective materials form only one component of a complete electrical and environmental reliability design. Even with excellent insulating properties, a coating cannot…
