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Main Junction Box(MJB)

Main Junction Box(MJB)
Main Junction Box(MJB)
Product Code : 46
Product Description
Main Junction Box(MJB):

A Main Junction Box (MJB) is used to combine the multiple outputs from multiple numbers of Array Junction Boxes in the Power Plant and form a single output that can be connected directly to the DC Distribution Board (DCDB) or Power Conditioning Unit (Solar Inverter).

  • The main important features of the Main Junction Box are to provide a single output.
  • The MJB consists of two bus bars. One is used to combine all the positive terminals and the other is used to combine the negative terminals.
  • Efficient String Monitoring - Optional
Main Functional Features of The Main Junction Box


Terminal Block/Bus Bar

Disconnect Fuse

SPD 600/1000V


String Monitoring Facility-Optional

Other Accessories

Parameters Array configuration String configuration
Maximum DC Input Range 1000V 1000V
No of DC Inputs 2 - 16 2 - 24
No of DC Outputs 1 1 - 8
Number of Terminal Blocks 4 - 34 4 - 48
Reverse Blocking Diode, No’s 2 - 12 2 - 24
Maximum Input Fuse* Rating, A 3/5/10/12/15/20/30 12/16/32/40/63
Maximum string current per fuse holder with all string fuse** Reduction factor 0.55 Reduction factor 0.55
Maximum DC Current, A 100 192
Maximum Continuous Current, A 160 240
Isolator/MCB*, A 16/32/40/63 16/32/40/63
Maximum Voltage, VDC 600/1000 600/1000
+Ve Input Wire Size,1C x sqmm 2.5 - 10 4 - 25
-Ve Input Wire Size, 1C x sqmm 2.5 - 10 4 - 25
MOV 110/680V 110/680V
Surge Protection Device (SPD)* 600/1000V, Class II 600/1000V, Class II
Operating Temperature -25 to 55 -25 to 55
Enclosure Type PS/PC* PS/PC*
Protection Type/Protection Class IP65 IP65
Connectors* @ Output MC4/MC3 MC4/MC3
Cable gland clamping range, mm 12 - 32 12 - 32
Wall mounting Yes Yes
Bus Bar* Yes Yes
Operating conditions Temp : -20 to +55 Deg. C ;  RH : 0 – 95% non cond
Type of Protections(As per Clients requirement) Short-Circuit, Surge Short-Circuit, Surge
International standards followed IEC 60364 IEC 60364
Disconnection switch Optional Optional
Design Life 25 years +
*Optional Features

GEESYS Technologies (India) Private Limited

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