Enclosed DC Switch IP67 Nema 4X 2 Pole 1 String 55A 800VDC Lockable Rotary Handle

Product Name

Enclosed DC Switch IP67 NEMA 4X, 2 Pole, 1 String, 55A, 800VDC, Lockable Rotary Handle (SI55-PEL64R-2)

Overview

The SI55-PEL64R-2 is a high-performance enclosed DC switch designed specifically for photovoltaic (PV) applications. It provides safe and reliable DC isolation for a single PV string and is suitable for outdoor installation thanks to its IP67 and NEMA 4X rated enclosure. The switch features a lockable rotary handle, TRUE DC switching technology, and fast arc suppression to ensure maximum safety and long service life.

Product Identification

Series: SI Series DC Solar Isolator

Model: SI55-PEL64R-2

Switch Type: TRUE DC Switch-Disconnector

String Capacity: 1 String

Electrical Ratings

Rated Current (IEC): 55 A

UL Current Rating: 55.00 A

Rated Operational Voltage: 800 VDC

Rated Insulation Voltage (Ui): 1500 VDC

Number of Poles: 2P

Utilisation Categories: DC-PV1, DC-PV2, DC-21A, DC-21B, DC-22B

Mechanical & Installation Details

Handle Type: Lockable Lever / Rotary Handle

Lockable: Yes

Mounting: Enclosed

Polarity: Polarity Independent

Environmental Protection

Ingress Protection: IP67

NEMA Rating: NEMA 4X

Operating Temperature Range: -40°C to +45°C

Outdoor Use: Suitable for harsh environmental conditions

Cable Terminations

Cable Size (Metric): 2.5 – 25 mm²

Cable Size (AWG): 16 – 10 AWG

Switching & Safety Features

• TRUE DC knife-edge contacts ensure safe and reliable DC switching.
• Operator-independent spring mechanism provides rapid contact separation.
• Fast arc suppression (typically ≤ 3 ms) minimizes arc energy.
• Double break per pole improves electrical endurance and safety.
• Self-cleaning contact action enhances long-term reliability.

Handle & Locking Safety

• The lockable rotary handle allows secure locking in the OFF position to prevent accidental operation during maintenance.
• Enclosure access is only possible when the switch is in the OFF position, ensuring operator safety.

Compliance & Certifications

UL Standards: UL 508I, UL 60947-1, UL 60947-4-1

IEC / EN Standards: IEC 60947-1, IEC 60947-3

Australia / New Zealand: AS 60947.3, ESV Level 3 Approval (RCM)

Other Compliance: CE, UKCA, RoHS

Typical Applications

• Residential solar PV systems
• Commercial and industrial PV installations
• PV string-level DC isolation
• Inverter DC input isolation
• Outdoor DC isolator mounting near PV arrays or inverters

Key Benefits

• Designed specifically for DC solar applications
• High current and voltage capacity for modern PV systems
• Excellent environmental protection with IP67 and NEMA 4X ratings
• Lockable handle ensures safe maintenance isolation
• Reliable performance in extreme temperatures and outdoor conditions

Downloads

DC Isolator Selection Guide

String Box Selection Guide

UL North America Selection Guide

Technical

Technical Datasheet

Certifications

CE Declaration

UL Certification

RCM Certification