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
UL North America Selection Guide
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