RAM - Load Break Switchgear

G&W Electric RAM padmount and vault switchgear feature load break switching capability in a totally sealed, dead front device. The switches are designed for use on 3-phase systems with voltages up to 38kV, 900A load break and continuous current, and 40kA asymmetrical momentary and close into fault ratings. They feature available compact footprints with front or top access construction. These switches are extremely flexible and are offered in many different styles. The high voltage connections can be positioned on the bottom, top, or side to ease cable training and installation.

The switches are designed to IEEE C37.72 and C37.74 for load break capability. Padmount enclosures are designed and tested to IEEE C57.12.28 and C57.12.29.

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Features and Benefits

Configurations Chart for RAM, PRAM and SPRAM (SF6 Padmount Switch)
# of WaysOne-line Diagram (Horizontal)Voltage Class (kV)Mom. (kA asym)Catalog NumberApproximate
Width* in. (mm)Wt. w/SF6 lbs (kg)
2
1540PRAM21-376L-40PI41
(1041)
1550 (705)
25PRAM21-386L-40PI
35PRAM21-396L-40PI
3
1540PRAM33-376L-40PI55
(1397)
1682 (763)
25PRAM33-386L-40PI
35PRAM33-396L-40PI
4
1540PRAM44-376L-40PI70
(1778)
1800 (818)
25PRAM44-386L-40PI
35PRAM44-396L-40PI
5
1540PRAM55-376L-40PI86
(2184)
2400 (1089)
25PRAM55-386L-40PI
35PRAM55-396L-40PI
6
1540PRAM66-376L-40PI101 (2565)2600 (1182)
25PRAM66-386L-40PI
35PRAM66-396L-40PI
15 kV: Enclosure depth = 50.8" (1289mm), Height = 55.0" (1397mm)
25 kV and 35 kV: Enclosure depth = 57.8" (1468mm), Height = 55.0" (1397mm)
Ratings Chart for PRAM
Voltage Class15 kV25 kV35 kV
Maximum Design Voltage15.5 kV27 kV38 kV
Impulse Level (BIL)110 kV125 kV150 kV
One Minute Withstand35 AC kV60 AC kV70 AC kV
One Minute Withstand, Protection Test Rating34 AC kV40 AC kV50 AC kV
15 minute withstand53 DC kV78 DC kV103 DC kV
** Continuous and load break current630 Amps630 Amps630 Amps
Momentary current40 kA asym40 kA asym40 kA asym
* Fault-close current (3 times)40 kA asym40 kA asym40 kA asym
One second current25 kA asym25 kA asym25 kA asym
Open Gap withstand200 kV200 kV200 kV
* 10 operation overload interrupting capability3000 amps3000 amps3000 amps
* Operations load interrupting at 600a120012001200
Mechanical endurance, operations200020002000
* Rating shown for Linear Puffer, Rotary Puffer limited to 32kA asym
** Available at 900Amps
Ratings Chart for RAM
Voltage Class15 kV25 kV35 kV
Maximum Design Voltage15.5 kV27 kV38 kV
Impulse Level (BIL)110 kV125 kV150 kV
One Minute Withstand35 AC kV60 AC kV70 AC kV
One Minute Withstand, Protection Test Rating34 AC kV40 AC kV50 AC kV
15 minute withstand53 DC kV78 DC kV103 DC kV
** Continuous and load break current630 Amps630 Amps630 Amps
Momentary current40 kA asym40 kA asym40 kA asym
* Fault-close current (3 times)40 kA asym40 kA asym40 kA asym
One second current25 kA asym25 kA asym25 kA asym
Open Gap withstand200 kV200 kV200 kV
* 10 operation overload interrupting capability3000 amps3000 amps3000 amps
* Operations load interrupting at 600a120012001200
Mechanical endurance, operations200020002000
* Rating shown for Linear Puffer, Rotary Puffer limited to 32kA asym
** Available at 900Amps
Ratings Chart for SPRAM
Voltage Class15 kV27 kV38 kV
Maximum Design Voltage15 kV27 kV38 kV
Impulse Level (BIL)110 kV125 kV150 kV
One Minute Withstand35 AC kV60 AC kV70 AC kV
One Minute Withstand, Protection Test Rating34 AC kV40 AC kV50 AC kV
15 minute withstand53 DC kV78 DC kV103 DC kV
** Continuous and load break current630 Amps630 Amps630 Amps
Momentary current40 kA asym40 kA asym40 kA asym
* Fault-close current (3 times)40 kA asym40 kA asym40 kA asym
One second current25 kA asym25 kA asym25 kA asym
Open Gap withstand200 kV200 kV200 kV
* 10 operation overload interrupting capability3000 amps3000 amps3000 amps
* Operations load interrupting at 600a120012001200
Mechanical endurance, operations200020002000
* Rating shown for Linear Puffer, Rotary Puffer limited to 32kA asym
** Available at 900Amps

For Accessories and additional options see full catalog.

Product Literature

SF6 Padmount

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SF6 Vault

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SF6 Seismically Certified

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Case Studies

University FLISR Solution

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University Network Upgrade with Automation

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Application Guides

Submersible Switchgear Applications

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Specifications

PRAM Specification

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SPRAM Specification

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Seismically Certified SPRAM Specification

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GRAM (front operator with bottom cables) Specification

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Seismically Certified RAM Specification

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SVRAM (front operator with top cables) Specification

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