Test unit BI-9 | PJ1 3X380/220 5A(20A) 3000V

BI-9 | PJ1 3×380/220 5A(20A) 3000V Test Block

⚡ BI-9 PJ1 is a switching test block for electrical measurement circuits. It is used in three-phase electricity metering systems, relay protection and automation circuits where measuring equipment must be conveniently tested, serviced or replaced.

The test block is installed in an electrical panel between the measuring circuits and connected equipment. Its purpose is to provide electricians or metering specialists with convenient access to the circuits without repeatedly dismantling the permanent wiring.

⚙️ Main specifications

• Product: BI-9 test block
• Designation: PJ1
• System: three-phase
• Voltage marking: 3×380/220 V
• Current marking: 5A(20A)
• Test voltage: 3000 V
• Purpose: switching and testing measurement circuits
• Applications: electricity meters, current transformers, relay protection and automation, measuring instruments
• Installation: electrical switchboards and metering cabinets

🔎 What is the BI-9 used for?

In commercial electricity metering systems, the meter is often connected through current transformers. A current transformer is a special transformer that reduces a large network current to a standardized lower value suitable for measurement by the electricity meter.

When such a meter is tested or replaced, its current circuits must not simply be disconnected arbitrarily. A test block provides the required switching point directly inside the electrical panel.

In typical metering circuits, the test block can be used for:

• 🔧 testing and servicing an electricity meter;
• disconnecting the meter's voltage circuits;
• working with current-transformer secondary circuits;
• safely shorting the appropriate secondary current circuits according to the approved wiring scheme;
• connecting a reference or control meter;
• performing measurements without completely disconnecting the permanent wiring;
• servicing relay protection and automation circuits.

⚡ What does 3×380/220 V mean?

The 3×380/220 V marking indicates use in a three-phase electrical system of the corresponding voltage class: 380 V phase-to-phase and 220 V phase-to-neutral.

🔌 What does 5A(20A) mean?

This model carries the marking 5A(20A). The 5 A value corresponds to a widely used nominal secondary current for measurement current transformers.

📌 The 20 A value appears on the specific product marking, but no publicly available manufacturer datasheet was found that separately explains the conditions associated with this value. It is therefore more accurate to retain the original 5A(20A) marking rather than state that 20 A is the continuous operating current without the exact product passport.

🛡 What does 3000 V mean?

The 3000 V marking refers to the insulation test voltage. It does not mean that the block is designed for normal operation on a 3000 V network.

The operating system for this model is marked 3×380/220 V, while the higher voltage is used when verifying the electrical strength of the insulation.

🏭 Applications

• commercial electricity metering panels;
• three-phase transformer-connected electricity meters;
• AMR/AMI electricity metering cabinets;
• current transformer circuits;
• electrical switchrooms;
• industrial facilities;
• substations and distribution equipment;
• relay protection and automation circuits;
• laboratory and commissioning circuits.

✅ Advantages

• simplifies electricity meter testing and maintenance;
• reduces the need to dismantle permanent wiring;
• provides convenient test connections in measurement circuits;
• useful when working with current transformers;
• suitable for three-phase metering systems;
• used in professional metering and protection panels;
• facilitates connection of reference and test equipment.

⚠️ Important installation information

Installation and switching must be carried out by qualified electrical personnel according to an approved wiring diagram.

Special care is required when working with current-transformer secondary circuits. Incorrectly opening such a circuit while the primary system is energized can produce a hazardous voltage and may damage equipment.

Before connection, verify the wiring diagram of the specific BI-9 block, the function of each terminal, conductor markings and the electricity meter connection diagram.

📌 The BI-9 is not a circuit breaker or an overload-protection device. Its main function is convenient switching and testing of measurement and control circuits.

⚡ BI-9 | PJ1 3×380/220 5A(20A) 3000V is a practical solution for professional electricity metering installations, making it easier to test, service and replace measuring equipment.