Fuses-type Isolating Switch

ELSF Series Fuse Type Isolating Switch

ELSF series fuse-type isolating switches works with NH00 and NH01 type fuses. Has a working voltage range of 0-500V DC and 0-690V AC with a maximum current of 800A. The working current varies according to size of fuse used.

Product Details

Product Descriprion

● UPS for the power supply of computers and servers
● Telecommunication power supply
● Metering and lighting module applications
● Switchboards
● Capacitor banks
● General fuse for power supply networks
● Power supply and generation fuse protection

Application

Normal operating conditions and installation conditions

The ambient air temperature should not be higher than +50°C and not lower than -5°C .

Humidity:When the maximum temperature is +50 °C,the relative humidity of the air does not exceed 50%. Higher relative humidity is allowed at lower temperatures,such as 90% at 20 °C. Special measures should be taken against occasional condensation due to temperature changes .

The pollution level of the surrounding environment is level 3.

The switch should be installed in a place without significant vibration away from hazardous and flammable materials .

Has an IP30 rating when closed and IP20 rating when open .

The relationship between switches and fuses

Agreed heating current (A)	Fuse link model	Rated working voltage (V)	Optional fuse (A)
Max 160	NT00 RT16-00	1-220VDC	4、6、10、16、20、25、32、35、40、50、65、80、100、125、160
		220–500VDC	4、6、10、16、20、25、32、35、40、50、65、80、100、125
		220–400VDC	4、6、10、16、20、25、32、35、40、50、65、80、100、125、160
		400-690VAC	4、6、10、16、20、25、32、35、40、50、65、80、100、125
Max 250	NT1 RT16-1	1-500VDC	80、100、125、160、200、225、250
		220–400VDC	80、100、125、160、200、225、250
		400-690VAC	80、100、125、160、200

Switch technical parameters

Model	ELSF-160				ELSF-250
Number of poles	2P				2P
Rated operational voltage Ue AC (V)	--	--	500	690	--	500	690
Rated operational voltage Ue DC (V)	220	500	--	--	500	--	--
Rated operational current Ie (A)	160	125	160	125	250	250	200
Thermal current with fuse-link Ith (A)	160	160	160	160	250	250	250
Utilization category	DC22B	DC22B	AC22B	AC21B	DC22B	AC22B	AC21B
Rated insulation voltage Ui (V)	1000				1000
Rated impulse withstand voltage Uimp (kV)	8				8
Rated conditional short circuit current (kArms)	50				50
Rated frequency (Hz)	50/60				50/60
Power loss(Ith)without fuse link,per phase (W)	3.5				7.5
Electrical durability	200				200
Mechanical durability	1400				1400
Degree of protection from the front according to IEC60529	Open	IP20				IP20
	Closed	IP30				IP30

The rated voltage of the auxiliary switch is AC 380V,the agreed heating current is 5A,the usage category is AC-15,and the rated working power is 300VA.

Structure

The switch is composed of a base,a cover and a contact bridge.The fuse is installed inside the cover.The cover can rotate in a fan shape along the support.It h as a large electrical isolation distance to meet the requirements of the isolating switch.The cover can be easily removed from the base.Removable,making it easy to install and replace the fuse link.

There are two sets of mounting holes on the base,which can meet the installation requirements in various switch cabinets and on panels.On both sides of the switch,auxiliary contacts can be installed as needed to send signals indicating the opening and closing status of the switch.

Shape and installation dimensions

ELSF-160 External dimension drawing

Detailed description:

The ELSF series comprises robust fuse-type isolating switches that combine the functions of a disconnector and a fuse base, ensuring both operational safety and circuit protection. These devices are engineered for use with standard NH00 (e.g., NT00 RT16-00, max 160A) and NH01 (e.g., NT1 RT16-1, max 250A) fuse links, supporting a wide range of optional fuse ratings from 4A to 250A depending on the operational voltage (AC: up to 690V; DC: up to 500V).

Constructed from a base, cover, and contact bridge, the switch is designed for durability and safety. The cover rotates to create a large, visible isolation distance, meeting strict isolator standards, and is easily removable for fuse replacement. The units feature a rated insulation voltage (Ui) of 1000V, an impulse withstand voltage (Uimp) of 8kV, and a high conditional short-circuit current rating of 50 kA. Key technical parameters include a utilization category of AC-21B/AC-22B or DC-22B, an electrical durability of 200 cycles, and a mechanical endurance of 1400 cycles. Models like the ELSF-160 and ELSF-250 have a thermal current (Ith) of 160A and 250A, respectively, with a power loss of 3.5W (160A) and 7.5W (250A) per phase without the fuse.

These switches are designed for installation in environments with a pollution degree of 3, an ambient temperature range of -5°C to +50°C, and protection ratings of IP20 (cover open) and IP30 (cover closed). They are suitable for applications such as UPS systems, telecommunication power supplies, capacitor banks, and general power distribution networks, providing a reliable and safe solution for circuit management.