| Brand | ROCKWILL |
| Model NO. | Load Break Disconnect |
| Rated voltage | 38kV |
| Rated normal current | 600A |
| Rated lightning impulse voltage | 150kV |
| Series | M3C |
Chance Type M3C Load Break Disconnect Switches are Single Phase Hook Stick operated units ideal for manual switching up to 38kV 150kV BIL. They are Single Insulator "Cutout Style" Mounted making them ideal for riser applications. They are rated either 900A or 600A and offered with NEMA B brackets or D Brackets for cross arm mounting or pole mounting. All M3C disconnects include load break hooks for use with a portable load break tool. These also serve as a blade closing guide. Each switch has silver plated contract areas for smooth current transfer and a positve latching blade mechanism to prevent unwanted opening during surges. Each pull ring has a pry out lever which helps opeing under ice conditions. The Chance M3C units are offered with ESP Enhanced Silicone Polymer insulating material. Each M3C is tested and manufactured in complete compliance with IEEE C37.30.1 Standard. Chance: The Brand and Quality You Can Trust!!
Fully Compliant with ANSI/IEEE C37.30.1
15, 27 & 38kV Voltage Classes
110, 125 and 150kV BIL Insulation Levels
600A & 900A Current Ratings
Uses Chance Type C Polymer Cutout Insulator Assemblies
Uses NEMA B Brackets for Cross Arm mounting
Load Break Option Available
The Loadbreak M3D and M3C provides an effective and efficient way to disconnect loads without the use of a separate
Loadbreak Tool. Line crews can work more quickly and safely with less equipment on hand. With its single pull operation, the
Loadbreak M3D and M3C can safely isolate portions of the distribution system with the same ease as a standard single phase
disconnect.
Same as used on our AR GOAB Switch. Interrupter provides current interruption without external arc or flame. High-strength
polyurethane material for strength, weatherability and UV resistance. Bolted tongue-in-groove mounting ensures positive
alignment.
This is a Load-breaking device, does not operate as a Load-make device.
Parameters
| Distribution Class Ratings | |
| Nominal Voltage / BIL | 15kV/110kV, 27kV/125kV, 38kV/150kV, 38kV/200kV |
| Continuous Current | 600 or 900 amp |
| Momentary Current | 40,000 amperes asymmetrical |
| Short Time With-stand Current 2-sec. | 25,000 amperes sym |
| Deadending | 8,000 lb. (3629 kg) working load |
| Distribution Class (2.25" Bolt-Circle) Switch Ratings | |||||||||||
| Switch Electrical Ratings | Insulator Mechanlcal Ratings | ||||||||||
| Max. kV | Rated BIL* | Material | Leakage Distance, inches (mm) | Dry Arc Distance, inches (mm) | 60 Hz Flash-over, kV* | Cantilever, pounds (N) | Tension, pounds (N) | Torsion, in-lb. (Nm) | Compression, pounds (N) | Weight, lb. (kg) | |
| Wet | Dry | ||||||||||
| 15 | 110 | ESP Rubber | 17.2 (437) | 7.1 (180) | 30 | 38 | 1,200 (5,338) | 5,000 (22,241) | 3,000 (339) | 5,000 (22,241) | 2.90 (1.32) |
| Porcelain | 10.5 (267) | 6.0 (152) | 30 | 38 | 1,200 (5,338) | 5,000 (22,241) | 3,000 (339) | 5,000 (22,241) | 7.73 (3.51) | ||
| 27 | 125 | ESP Rubber | 21.9 (556) | 8.1 (206) | 45 | 50 | 1,000 (4,448) | 5,000 (22,241) | 3,000 (339) | 5,000 (22,241) | 3.30 (1.50) |
| Porcelain | 15.5 (394) | 7.0 (178) | 45 | 50 | 1,000 (4,448) | 5,000 (22,241) | 3,000 (339) | 5,000 (22,241) | 9.00 (4.08) | ||
| 38 | 150 | ESP Rubber | 28.0 (711) | 10.0 (254) | 60 | 70 | 800 (3,559) | 5,000 (22,241) | 3,000 (339) | 5,000 (22,241) | 4.50 (2.04) |
| Porcelain | 24.0 (610) | 9.5 (241) | 60 | 70 | 800 (3,559) | 5,000 (22,241) | 3,000 (339) | 5,000 (22,241) | 11.45 (5.19) | ||
| 38 | 200 | ESP Rubber | 52.0 (1320) | 15.7 (399) | 95 | 80 | 800 (3,559) | 5,000 (22,241) | 3,000 (339) | 5,000 (22,241) | 10.3 (4.67) |
*ANSI Rating. Less than test results. Test reports available upon request.
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