protection up to 60 V, the upper limit of the overvoltage range. Effective terminal secondary locking is also essential to prevent terminal push outs (TPOs), which can cause slow or intermittent power disconnects. Such disconnects may initiate micro- arcing, damaging the plating or compromising the terminal base metal, leading to high resistance or a welded connection. Connector sealing also merits careful attention. Exposure of a 48 V connector to an electrolyte such as salt water can trigger an aggressive electrochemical reaction, more so than at 12 V. To prevent such damage and short circuits, it is crucial to use connectors that meet the appropriate pollution degree, typically USCAR-2 Sealing Class 2 or higher.
Figure 2 illustrates how these design principles are
and prevents accidental disengagement under severe vibration or shock ■ Integral mat and ring seals that ensure safe performance even when submerged, eliminating the need for individual cable seals ■ A grommet cap that enhances the protection of the mat seal and ensures the correct alignment of terminals, maintaining the integrity of connections
implemented in the 3003610011, a dual-row, mid-voltage female receptacle with twenty circuits. The corresponding male connector is the 0334822423. The MX150 connectors are pre-assembled with connector housings, seals, and Terminal Position Assurance (TPA) components in place, streamlining installation and maintenance. Key features of the connector illustrated in Figure 2 include: ■ A TPA that securely locks terminals into their housings, preventing dislodgment ■ A secondary Connector Position Assurance (CPA) lock that ensures a secure connection
Mixed-voltage design considerations
Special precautions are essential in mixed-voltage systems to prevent current from flowing between mid-voltage and low-
voltage circuits. The most effective strategy is to use
Figure 2: The MX150 Mid-Voltage Connector System incorporates several features to ensure a safe and reliable connection. Shown is the 3003610011 dual-row female receptacle with 20 circuits. (Image source: Molex)
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