Under Indonesian PUIL 2011 and IEC 61439 standards, PHB (Perangkat Hubung Bagi) is the overarching umbrella term for all electrical switchgear and controlgear assemblies. In industrial plant distribution, LVMDP (Low Voltage Main Distribution Panel) serves as the primary switchboard connected directly to the secondary winding of distribution transformers (400V/230V), housing motorized Air Circuit Breakers (ACB) up to 4,000 A. Meanwhile, PUTR (Panel Utama Tegangan Rendah) is the formal utility nomenclature used interchangeably by PLN for main low-voltage distribution boards.
Standard Definitions Under PUIL 2011 & IEC 61439
In technical discussions across Indonesian industrial facilities, terms like LVMDP, PUTR, and PHB are frequently used interchangeably. However, engineering procurement documents demand precise distinctions.
PHB (Perangkat Hubung Bagi) is the official regulatory term defined in PUIL 2011 as a combination of one or more low-voltage switching devices with associated control and protective apparatus. Every LVMDP or PUTR is legally a PHB, but not every PHB is an LVMDP.
The Core Role of LVMDP: Heart of Industrial Distribution
An LVMDP connects directly to the secondary 400V/230V winding of distribution transformers via busduct or high-amperage cables. It feeds all downstream Sub Distribution Panels (SDP), Motor Control Centers (MCC), and automatic capacitor banks.
BRT switchboards feature Form 2b or Form 3b segregation, ensuring complete physical isolation between busbar bars, breaker compartments, and external cable connection terminals.
Copper Busbar Sizing & ACB Protection Coordination
Undersizing copper busbars is the primary cause of industrial switchboard fires. For a 1,600 kVA transformer (~2,309 A full load), the main busbar must be designed for at least 2,500 A to 3,200 A continuous rating under tropical ambient temperatures.
BRT utilizes certified electrolytic Cu-ETP copper bars (>99.9% purity) with electro-tin plating, coordinated with electronic motorized ACBs providing complete LSIG protection.
Frequently Asked Questions
What is the operational difference between an LVMDP and an SDP?
An LVMDP is the primary distribution board connected directly to transformer secondaries, whereas an SDP (Sub Distribution Panel) distributes power downstream from the LVMDP to specific production sectors.
When is an Air Circuit Breaker (ACB) mandatory instead of an MCCB?
ACBs are mandatory for main incoming circuits rated 800 A and above due to their superior short-time withstand ratings (Icw 1s) and maintainable draw-out mechanisms.
Gatot Baskoro Adi
With over 18 years of medium-voltage electrical engineering leadership since 2008, Gatot Baskoro Adi holds three SKK Level 5 licenses issued by PT Andalan Profesi Elektrikal Indonesia under the Ministry of Energy and Mineral Resources. He has directed more than 23 major industrial projects and 8 completed installations for Malaysian conglomerate KLK Group across Sumatra and Kalimantan.