A DC isolator switch is an electrical safety device that manually disconnects itself from the modules in a solar PV system. In PV applications, DC isolator switches are used to manually disconnect the solar panels for maintenance, installation or repair purposes.

In most solar PV installations, two DC isolator switches are connected to a single string. Normally, one switch is placed close to the PV array and the other close to the DC end of the inverter. This is to ensure that disconnection can be achieved at ground and roof level. DC isolators can come in polarized or non-polarized configurations. For DC isolator switches that are polarized, they come in two, three and four pole configurations.

Technical Data

Main Parameters	PM32
Rated insulation voltage Ui	1500V
Rated thermal current Ithe	32A
Rated impulse withstand voltage Uimp	8000V
Rated short-circuit making capacity Icm	2H	1700A
	2,4	1000A
	2H	1700A
Rated conditional short-circuit current Icc	5000A
Max. fuse size gL (gG)	80A
Maximum cable cross sections (incl. jumper)
Solid or standard	mm2	4-16
Flexible		4-10
Flexible (+ multicore cable end)		4-10
Torque
Tightening torque terminal screws M4.	Nm	1.2-1.8
Tightening torque panel mounting screws ST4.2(304 stainless steel)		0.8-0.9
Tightening torque knob screws M3		0.5-0.7
Switching on or off torque		0.9-1.3
General parameters
Method of mounting	Single Hole Mounting
Type of knob	C
Knob positions	OFF at 12 hr, ON at 3 hr
Mechanical life	10000
Number of DC poles	2 or 4
Operation temperature	-40℃ to +70℃
Storage temperature	-40℃ to +85℃
Pollution degree	2
Overvoltage category	III
IP rating of shafte and mounting nut	IP66

Dimensions

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