Projoy PEDS150-EL55R-4 4MC4 DC Isolator Switch 55A 4 Pole 2 String 1500V DC Lockable Rotary Handle for Solar PV

Description

Lockable 55A DC isolation for two PV strings.

The Projoy PEDS150-EL55R-4 (4MC4) is a 4 pole enclosed DC isolator switch that disconnects two solar PV strings with one lockable rotary handle. It carries a 1500V DC insulation rating, a 55A thermal current and DC-PV1/DC-PV2 utilisation ratings to IEC/EN 60947-3.

Key Features

• 4 DC poles switching 2 PV strings
• EL enclosure installation, 4MC4 version
• Rated insulation voltage (Ui) 1500V DC
• Rated thermal current (Ith) 55A
• DC-PV1: 55A at 600V, 45A at 800V, 33A at 1000V
• DC-PV2: 50A at 600V, 40A at 800V, 32A at 1000V
• Rotary knob with lock (R version)
• 8kV impulse withstand, 780A short-time withstand (1s)
• Operating temperature -40°C to +85°C, derated above +70°C
• IP66 rated shaft and mounting nut
• SAA approval no.:

Grab yours for your next string inverter install.

Why it Matters

Ratings fall as string voltage rises
A DC isolator's switching current depends on system voltage and utilisation category. Projoy's DC-PV1 figures for this 55A switch run from 55A at 600V to 18A at 1500V, and its DC-PV2 figures from 55A at 300V to 10A at 1500V. Compare your string's maximum open-circuit voltage and current with the full tables before selecting it.

Lock-off for safe maintenance
The R in the model code denotes a knob with lock, so the switch can be secured while work is carried out on the array or inverter. Projoy specifies 8mm contact distance per pole, contact resistance of 3m? or less and insulation resistance of 50M? or more.

Derating and connections
The rated current holds to +70°C ambient, then reduces to 92% at 75°C, 84% at 80°C and 76% at 85°C, and Projoy publishes an altitude derating curve. Terminals take 4-16mm² solid or standard conductors on M4 screws at 1.2-1.8 Nm. Projoy's ratings describe the switch, so also confirm the MC4 connectors and string cable suit the string current. Installation must be carried out by a licensed electrician in line with AS/NZS 3000 and AS/NZS 5033.

Q: How many PV strings does the Projoy PEDS150-EL55R-4 (4MC4) isolate?
A: Two. Projoy's data lists the 4 pole version for 2 strings, with both conductors of each string switched by the one handle.

Q: What current can the PEDS150-EL55R-4 switch at 1000V DC?
A: Projoy rates it at 33A at 1000V DC under DC-PV1 and 32A at 1000V DC under DC-PV2. Its rated thermal current is 55A.

Q: What cable size suits the PEDS150-EL55R-4 terminals?
A: The terminals accept 4-16mm² solid or standard conductors, tightened to 1.2-1.8 Nm on M4 terminal screws.