IMO 25A 700VDC 2-Pole Enclosed Solar DC Disconnect Switch IP65 | SI25-PEL64R-2

The IMO SI25-PEL64R-2 is a 2-pole enclosed TRUE DC solar isolator designed specifically for safe disconnection of photovoltaic DC circuits. Part of the IMO SI Series, it combines a 25A switch platform, polarity-independent switching architecture, rapid arc suppression, and a lockable rotary handle within a durable enclosure for PV system isolation applications.

The PEL64R configuration identifies an enclosed version equipped with a lockable rotary handle. IMO specifies the enclosed PEL64R configuration with an IP67 / NEMA 4X protection rating, making it suitable for demanding indoor and outdoor PV installations when installed according to manufacturer requirements.

The SI25 platform supports a wide range of DC operating voltages, with current ratings dependent on the applicable utilization category and system voltage. In one manufacturer PV design example, the SI25-PEL64R-2 is rated at 11A at 1000VDC for individual string isolation, while another example identifies 16A operation at 800–900VDC.

Key Technology

• TRUE DC Solar Isolation
  Purpose-built for photovoltaic DC switching rather than being adapted from a conventional AC isolation platform.

• 25A SI Series Switch Platform
  The SI25 designation identifies the 25A switch class, with actual allowable operational current dependent on DC voltage, switching configuration, utilization category, installation environment, and applicable standards.

• 2-Pole Configuration
  The “-2” configuration provides two-pole switching, suitable for isolating both positive and negative PV conductors in appropriate system designs.

• Enclosed PEL64R Design
  The PEL64R configuration combines the SI switch with a dedicated enclosure and lockable rotary operating handle.

• IP67 / NEMA 4X Enclosure
  Provides a high degree of environmental protection for outdoor and exposed PV installation locations.

• Lockable OFF Operation
  The rotary operating handle can be secured in the OFF position to support safer servicing and maintenance procedures.

• Operator-Independent Switching
  The IMO mechanism uses spring-assisted snap action so contact opening speed is not dependent on how quickly the installer turns the handle.

• Fast Arc Suppression
  IMO's TRUE DC design incorporates dedicated arc-suppression chambers and a rapid break/make mechanism designed to extinguish DC switching arcs quickly.

• Knife-Edge Rotary Contacts
  The rotary contact mechanism provides double make/break action and a self-cleaning effect on the switching surfaces for dependable long-term contact performance.

• Polarity Independent
  The IMO Solar Isolator architecture is polarity independent, reducing the need for specific directional wiring of the PV supply. 

• Multiple DC Utilization Categories
  The SI platform is designed for applications classified under DC-PV1, DC-PV2, DC-21A, DC-21B, and DC-22A, depending on the specific configuration and electrical rating.

• UL 508I PV Disconnect Certification
  The SI solar isolator platform has been evaluated for photovoltaic manual-disconnect applications under UL 508I. 

Best Uses

• PV String Isolation
  Ideal for providing a dedicated means of disconnecting a photovoltaic string from downstream inverter equipment.

• Residential Solar Systems
  The compact 2-pole enclosed design is well suited to residential PV installations requiring external DC isolation.

• Outdoor Solar Equipment
  IP67 / NEMA 4X enclosure protection provides flexibility for installation in suitable outdoor environments.

• High-Voltage PV Strings
  Can be applied to higher-voltage PV strings when the operating current is within the applicable manufacturer rating for the selected voltage and utilization category.

• Maintenance Isolation
  The lockable rotary handle provides a convenient physical isolation point for system inspection, servicing, and maintenance.

Product Specifications

Reliable Enclosed DC Isolation for PV Systems

The IMO SI25-PEL64R-2 combines a 25A SI switch platform, 2-pole TRUE DC architecture, lockable rotary handle, IP67 / NEMA 4X enclosure, polarity-independent operation, and rapid arc suppression in a compact photovoltaic disconnect solution. Its voltage-dependent electrical ratings allow it to be applied across a broad range of PV string voltages when properly selected according to the manufacturer's technical data.

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