GRAM- Load Break Switching with Integral Ground Position

G&W Electric GRAM padmount and vault switchgear features load break switching capability with visible break and integral ground position in a totally sealed, submersible, dead front device. The integral ground position eliminates the need to handle any high voltage connections to ground the cable.  The switches are designed for use on 3-phase systems with voltages up to 38kV and 900A load break and continuous current. These switches are extremely flexible and are offered in many different styles. Switches are typically sold with the switch operators on the front side. 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 C37.71 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 GRAM
# of WaysOne-line Diagram (Horizontal)Voltage Class (kV)Close Into Fault (kA asym)/strong>Catalog NumberApproximate
Width* in. (mm)Wt. w/SF6 lbs (kg)
1532GRAM21-376M-40RP29 (737)700 (318)
40GRAM21-376M-40PI32.5 (825)600 (270)
2532GRAM21-386M-40RP29 (737)700 (318)
40GRAM21-386M-40PI32.5 (825)600 (270)
3532GRAM21-396M-40RP29 (737)700 (318)
40GRAM21-396M-40PI32.5 (825)600 (270)
1532GRAM33-376M-40RP40.5 (1029)950 (431)
40GRAM33-376M-40PI62.25 (1580)1400 (635)
2532GRAM33-386M-40RP40.5 (1029)950 (431)
40GRAM33-386M-40PI62.25 (1580)1400 (635)
3532GRAM33-396M-40RP40.5 (1029)950 (431)
40GRAM33-396M-40PI62.25 (1580)1400 (635)
1532GRAM44-376M-40RP52 (1321)1200 (544)
40GRAM44-376M-40PI80.5 (2045)1800 (815)
2532GRAM44-386M-40RP52 (1321)1200 (544)
40GRAM44-386M-40PI80.5 (2045)1800 (815)
3532GRAM44-396M-40RP52 (1321)1200 (544)
40GRAM44-396M-40PI80.5 (2045)1800 (815)
1532GRAM55-376M-40RP63.5 (1613)2500 (1136)
40GRAM55-376M-40PI98.75 (2510)2200 (1000)
2532GRAM55-386M-40RP63.5 (1613)2500 (1136)
40GRAM55-386M-40PI98.75 (2510)2200 (1000)
3532GRAM55-396M-40RP63.5 (1613)2500 (1136)
40GRAM55-396M-40PI98.75 (2510)2200 (1000)
1532GRAM66-376M-40RP75 (1905)2600 (1182)
40GRAM66-376M-40PI117 (2970)2600 (1180)
2532GRAM66-386M-40RP75 (1905)2600 (1182)
40GRAM66-386M-40PI117 (2970)2600 (1180)
3532GRAM66-396M-40RP75 (1905)2600 (1182)
40GRAM66-396M-40PI117 (2970)2600 (1180)
For rotary puffer (RP): Tank depth= 25" (635mm), Tank height = 27" (686mm)
For linear puffer (PI): Tank depth= 34" (865mm), Tank height = 32" (815mm)
*Dimensions are approximate and do not include entrances, gauges, frames, or operators
Ratings Chart for GRAM
Voltage Class15kV25kV35kV
Maximum Design Voltage15.5kV27kV38kV
Impulse Level (BIL)110kV125kV150kV
One Minute Withstand35 AC kV60 AC kV70kV
One Minute Withstand, Protection Test Rating34 AC kV40 AC kV50kV
15 minute withstand53 DC kV78 DC kV103kV
** Continuous and load break current630 Amps630 Amps630 Amps
Momentary current40kA asym40kA asym40kA asym
* Fault-close current (3 times)40ka asym40ka asym40ka asym
One second current25kA asym25kA asym25kA asym
Mechanical endurance, operations200020002000
* Rating shown for Linear Puffer, Rotary Puffer limited to 32kA asym
** Available at 900Amps

For Accessories and additional options see the full catalog.

Product Literature

Gas Insulated Switchgear – Padmount


Gas Insulated Switchgear – Vault


Gas Insulated Switching Solutions Brochure

Case Studies

University FLISR Solution


University Network Upgrade with Automation

Application Guides

Submersible Switchgear Applications


GRAM (front operator with bottom cables) Specification


VGRAM (front operator with top cables) Specification