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On Load Isolator with Fuse Combinations

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On Load Isolator with Fuse Combinations Specification

Connector Type
Screw Terminal

Power Factor
1.0

Feature
Robust Construction, Easy Operation, Reliable Performance, Arc Quenching

Shape
Rectangular

Surface Finish
Powder Coated

Operating Temperature
-10C to +55C

IP Rating
IP54

Overheating Protection
Yes, via Fuse Element

Efficiency
98%

Humidity %
Up to 95% RH Non-Condensing

Insulation Material
Bakelite / DMC

Mounting Type
Surface Mounting / Panel Mounting

Product Type
On Load Isolator with Fuse Combination

Application
Industrial Electrical Switchgear

Protection Level
High - with Fuse Protection

Frequency (MHz)
50 Hz

Rated Voltage
415 V AC

Energy Consumption
Negligible

Output Type
Load/Line Terminal

Color
Light Grey

Dimension (L*W*H)
360 mm x 250 mm x 150 mm

Weight
12 kg

Phase
Three Phase

Size
Standard

Input Voltage
415V AC

No Of Poles
3

Connection Type
Panel Mount

Material
High Grade Sheet Metal and Copper

Mechanical Endurance
10,000 operations

Breaking Capacity
80 kA

Conformity Standard
IEC 60947-3

Fuse Type
DIN 43620 HRC fuse link compatible

Electrical Endurance
2,000 operations at rated load

Response Time
Instantaneous under load

Arc Extinguishing Method
Air break with quick arc quenching

Locking Mechanism
Padlock provision for safety

RoHS Compliance
Yes

Auxiliary Contacts
Optional, up to 2NO+2NC

About On Load Isolator with Fuse Combinations

On Load Isolator with Fuse Combinations

The outdoor On Load Isolator or Load Break Switches contained in the list are meant for the switching of feeder lines and ring mains or transformer feeders in connection with Fuses with tripping arrangement or with indication) for short circuit protection for switching under offload conditions.

They are produced in 6 modules:

1. For Vertical installation

2. For Horizontal installation on lattice towers, concrete or on wooden towers

3. Without fuses

4. In connection with fuses with tripping arrangement & with making capacity

5. In connection with fuses with tripping indication only

6. In connection with Drop Out fuses

The Load Break Switch complies with latest IEC 60265, VDE 0670 part 3.

The fuses comply with IEC 60282 and ANSI specification.

Features:

Hot dip galvanized switch shafts and base frames made of profiled steel.
Arrangement of the switch shafts in maintenance free bearings.
Hard porcelain/polycrete insulators are used.
Nickel plated electrolytic copper current paths.
Arc quenching medium of very low weight synthetic material, quenching by evaporation according to the hard gas principle.
MAX fuses rating upto 36kV, Breaking capacity 63kA, Elimination of gun powder and fire hazards by using mechanically operated striker pin in fuse.
Tripping force is 120kN
Drop out fuses can be supplied instead of MAX fuses.

Modified pole distances (dimension p) and extended shift (dimension x & y) are available at additional prices on request.
Sliver plated current paths will be provided on request.
Single pole outdoor On Load Isolator, On Load Isolator with earthing switch available on request.
If center attachment is desired, the dimensions b1 & b2 must be given when ordering.

Technical Data

Rated Voltage kV	Rated Current A	Type	Rated Mainly active load breaking current A	Rated transformer off-load breaking capacity kVA	Rated cable charging and line breaking current A	Rated closed loop breaking current A	Rated short time current kA/1 sec	Rated peak current kA	Rated lighting impulse withstand voltage kV
12	400	OT12/400	400	1250	35	400	25	63	75/85
24	400	OT 24/400	400	1250	20	400	16	40	125/145
36	400	OT 36/400	400	1250	16	400	16	40	170/195
12	400	OT112/400	400	1250	35	400	25	63	75/85
24	400	OT124/400	400	1250	20	400	16	40	125/145

OT (for vertical installation) with Earth Switch

Rated voltage kV	Rated current A	Type	Weight kg	Dimension (mm)
Rated voltage kV	Rated current A	Type	Weight kg	b	b1	b2	d	h	h1	k1	l	p	x	y	z
12	400	OT 12/400	115	1000	130	270	1050	310	290	560	710	400	100	100	20
24	400	OT 24/400	140	1250	165	335	1300	440	440	700	840	500	100	100	60

OT1 (for vertical installation)

Rated voltage

Rated current

Type

Weight

Dimension (mm)

400

OT1 36/400

225

2150

205

695

2200

460

720

860

900

100

OT (for horizontal installation) with Earth Switch

Rated voltage kV	Rated current A	Type	Weight kg	Dimension (mm)
Rated voltage kV	Rated current A	Type	Weight kg	b	d	h	h1	k1	l	p	x	y	z	z1
12	400	OT 12/400	115	1000	1050	310	290	560	710	400	100	100	20	180
24	400	OT 24/400	140	1250	1250	355	338	610	775	500	100	100	20	180
36	400	OT 36/400	225	2150	2200	460	460	720	860	900	100	100	20	180

OT WITH QUICK ACTING MECHANISM

Rated voltage kV	Rated current A	Type	Weight kg	Dimension (mm)
Rated voltage kV	Rated current A	Type	Weight kg	a	b	c	d	e	h	h1	k1	l	p	x	y	z
12	400	OT1 12/400	170	1000	1000	1110	1050	1110	290	290	560	710	400	40	255	20
24	400	OT1 24/400	200	1110	1250	1210	1300	1260	440	440	700	840	500	40	255	20

NOTE:

1. Current rating can be increased to 630A if desired.

2. As continuous developments are made to all MAX products, equipment supplied may differ in detail from that described above.

Robust Safety and Superior Performance

With a powerful 80 kA breaking capacity and conformity to IEC 60947-3 standards, this isolator delivers unparalleled electrical protection. The quick arc quenching system, padlock provision, and fuse-based overheating protection underscore its focus on user safety and operational reliability. Its sturdy construction and dust-proof, powder-coated finish enhance longevity and consistent performance in industrial environments.

Versatile Installation and Efficient Operation

Engineered for both surface and panel mounting, installation is straightforward with screw terminals. The isolators high grade materials, IP54 ingress protection, and robust design support use in diverse industrial settings. Optional auxiliary contacts facilitate system integration, while the fuse combination guarantees minimal energy waste and maximum safety. Maintenance is simplified, ensuring quick fuse replacement and reliable continuous service.

FAQs of On Load Isolator with Fuse Combinations:

Q: How does the On Load Isolator with Fuse Combinations enhance electrical safety in industrial switchgear applications?

A: This device offers high breaking capacity (80 kA), superior arc quenching through air-break mechanisms, and reliable fuse protection with DIN 43620 HRC fuse links. The padlock provision and IP54 enclosure ensure safe isolation, minimizing risk during maintenance or emergencies.

Q: What benefits does the DIN 43620 HRC fuse link compatibility provide?

A: The DIN 43620 HRC fuse compatibility ensures standardized, globally recognized protection, offering rapid response to overloads or faults. This design allows for easy fuse replacement and maximizes protection against overheating or short circuits.

Q: Where can the On Load Isolator with Fuse Combinations be installed?

A: Designed for surface and panel mounting on standard enclosures, this isolator is suitable for industrial environments requiring robust three-phase electrical isolation in India and internationally, wherever IEC 60947-3 conformity is required.

Q: When should the isolator be operated or maintained?

A: Routine operation is recommended according to switchgear maintenance schedules. The mechanical and electrical endurance ratings (10,000 and 2,000 operations, respectively) ensure long service life. Fuse replacement should be performed promptly after any protection event or according to preventive checks.

Q: How does the devices construction and material selection contribute to its performance?

A: The isolator uses high-grade sheet metal for durability, copper for optimal conductivity, and insulation materials like Bakelite/DMC to ensure electrical safety. The powder-coated finish enhances corrosion resistance, while robust construction supports reliable operation under harsh conditions.

Q: What is the process for connecting and operating this isolator?

A: Installation involves mounting the device on a panel/surface, connecting the load and line via screw terminals, and setting fuses. Operation is manual, with immediate response and safe mechanical isolation. Padlock provision and auxiliary contacts can be configured per system requirements.

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