RAM - Load Break Switchgear

G&W Electric RAM padmount and vault gas-insulated 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

Construction - Available compact construction with front accessible switch operators and bushings. Vault construction is also available with top or bottom bushings or top access to operators and bushings.

Visible Break - All ways are equipped with visible break to view the open and closed positions.

Voltage Sensing - Available integral voltage sensing for use with voltage indication panel to determine in-phase condition or for use with a relay with up to 1% accuracy.

Seismically Certified - The switches are available for order designed per the guidelines of ASCE (American Society of Civil Engineers) standard 7-05 Chapter 13. These guidelines cover the design of non structural components installed in a building. The switches also underwent a test regime specified by ICC-ES-AC-156 (International Code Council Evaluation Services Acceptance Criteria) which specifies the shaker table test inputs applied to the switches. Certified for use in OSHPD (Office of Statewide Health Planning and Development) projects for healthcare facilities in the State of California. The OSHPD application number on file is OSP-0157-10.

Automation - Available for motor automation with portable or permanently mounted motor and controls. A variety of relays such as SEL, ABB, and GE are available with G&W Electric programming and cabinet construction. Cabinets can be ordered in a low voltage enclosure for padmount, pedestal or IP68 rated submersible for vault installed switchgear. Programming for automatic source transfer, or LaZer custom solutions are available.

Configurations Chart for RAM, PRAM and SPRAM (SF6 Padmount Switch)

# of Ways	One-line Diagram (Horizontal)	Voltage Class (kV)	Mom. (kA asym)	Catalog Number	Approximate
					Width* in. (mm)	Wt. w/SF6 lbs (kg)
2		15	40	PRAM21-376L-40PI	41 (1041)	1550 (705)
		25		PRAM21-386L-40PI
		35		PRAM21-396L-40PI
3		15	40	PRAM33-376L-40PI	55 (1397)	1682 (763)
		25		PRAM33-386L-40PI
		35		PRAM33-396L-40PI
4		15	40	PRAM44-376L-40PI	70 (1778)	1800 (818)
		25		PRAM44-386L-40PI
		35		PRAM44-396L-40PI
5		15	40	PRAM55-376L-40PI	86 (2184)	2400 (1089)
		25		PRAM55-386L-40PI
		35		PRAM55-396L-40PI
6		15	40	PRAM66-376L-40PI	101 (2565)	2600 (1182)
		25		PRAM66-386L-40PI
		35		PRAM66-396L-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 Class	15 kV	25 kV	35 kV
Maximum Design Voltage	15.5 kV	27 kV	38 kV
Impulse Level (BIL)	110 kV	125 kV	150 kV
One Minute Withstand	35 AC kV	60 AC kV	70 AC kV
One Minute Withstand, Protection Test Rating	34 AC kV	40 AC kV	50 AC kV
15 minute withstand	53 DC kV	78 DC kV	103 DC kV
** Continuous and load break current	630 Amps	630 Amps	630 Amps
Momentary current	40 kA asym	40 kA asym	40 kA asym
* Fault-close current (3 times)	40 kA asym	40 kA asym	40 kA asym
One second current	25 kA asym	25 kA asym	25 kA asym
Open Gap withstand	200 kV	200 kV	200 kV
* 10 operation overload interrupting capability	3000 amps	3000 amps	3000 amps
* Operations load interrupting at 600a	1200	1200	1200
Mechanical endurance, operations	2000	2000	2000
* Rating shown for Linear Puffer, Rotary Puffer limited to 32kA asym
** Available at 900Amps

Ratings Chart for RAM

Voltage Class	15 kV	25 kV	35 kV
Maximum Design Voltage	15.5 kV	27 kV	38 kV
Impulse Level (BIL)	110 kV	125 kV	150 kV
One Minute Withstand	35 AC kV	60 AC kV	70 AC kV
One Minute Withstand, Protection Test Rating	34 AC kV	40 AC kV	50 AC kV
15 minute withstand	53 DC kV	78 DC kV	103 DC kV
** Continuous and load break current	630 Amps	630 Amps	630 Amps
Momentary current	40 kA asym	40 kA asym	40 kA asym
* Fault-close current (3 times)	40 kA asym	40 kA asym	40 kA asym
One second current	25 kA asym	25 kA asym	25 kA asym
Open Gap withstand	200 kV	200 kV	200 kV
* 10 operation overload interrupting capability	3000 amps	3000 amps	3000 amps
* Operations load interrupting at 600a	1200	1200	1200
Mechanical endurance, operations	2000	2000	2000
* Rating shown for Linear Puffer, Rotary Puffer limited to 32kA asym
** Available at 900Amps

Ratings Chart for SPRAM

Voltage Class	15 kV	27 kV	38 kV
Maximum Design Voltage	15 kV	27 kV	38 kV
Impulse Level (BIL)	110 kV	125 kV	150 kV
One Minute Withstand	35 AC kV	60 AC kV	70 AC kV
One Minute Withstand, Protection Test Rating	34 AC kV	40 AC kV	50 AC kV
15 minute withstand	53 DC kV	78 DC kV	103 DC kV
** Continuous and load break current	630 Amps	630 Amps	630 Amps
Momentary current	40 kA asym	40 kA asym	40 kA asym
* Fault-close current (3 times)	40 kA asym	40 kA asym	40 kA asym
One second current	25 kA asym	25 kA asym	25 kA asym
Open Gap withstand	200 kV	200 kV	200 kV
* 10 operation overload interrupting capability	3000 amps	3000 amps	3000 amps
* Operations load interrupting at 600a	1200	1200	1200
Mechanical endurance, operations	2000	2000	2000
* Rating shown for Linear Puffer, Rotary Puffer limited to 32kA asym
** Available at 900Amps