Resistance Substitution Box
Product Code : LSK-PL-10308
Resistance Substitution Box (SKU LSK-PL-10308) is a compact switched unit that lets a student dial any one of 12 fixed resistors into a circuit with a rotary switch, instead of swapping loose components. It serves Class 10–12 electricity practicals, B.Sc. and diploma electronics labs and ITI trade training. Science Lab Supplies builds the box at Plot 448, HSIIDC Industrial Area, Saha, Ambala, India, and prices it for schools, colleges, tender contractors and distributors without a reseller in between.
Specifications
The table gives every specification of the 12-resistor box. In short, twelve preferred-value resistors sit on a printed circuit inside a robust black plastic box; a rotary switch selects one value at a time, two yellow non-polar 4 mm terminals take it to the circuit, and each resistor is rated at 1 W maximum.
| Specification | Value |
|---|---|
| SKU | LSK-PL-10308 |
| Unit type | Switched resistance unit |
| Number of resistors | 12 |
| Values | Preferred values |
| Value range | 100 Ω to 470 Ω |
| Tolerance | 5% |
| Actual values | Can be closer to nominal than the 5% tolerance |
| Power rating | 1 W maximum per resistor |
| Selection | Rotary switch |
| Mounting | Printed circuit |
| Housing | Robust black plastic box |
| Terminals | Two 4 mm terminals |
| Terminal colour | Yellow, indicating non-polarity |
| Manufacturer | Science Lab Supplies, Saha, Ambala, Haryana |
| Country of origin | India |
Applications and Experiments for the Resistance Substitution Box
The box is used wherever a practical needs several known resistances in turn: Ohm's law readings, series and parallel checks, voltage dividers and trial values in simple electronic circuits. Turning the switch changes the value without rewiring, and schools looking for a lab resistance box in India can pair it with meters from the same range.
- Class 10 physics (Electricity): current–voltage readings for different resistances, with the potential difference read on a 0–20 V Voltmeter.
- Class 12 physics: supplying known resistances in circuit and bridge practicals.
- ITI Electronics Mechanic trade: resistor selection and measurement exercises.
Standard Scope of Supply
The Resistance Substitution Box is supplied as a single unit: the 12 resistors on their printed circuit, the rotary selector switch and the two 4 mm terminals, all housed in the black plastic box. Connecting Leads with 4 mm Safety Plugs and meters can be added to the quotation.
Packing, MOQ and Lead Time
Ask for one box for a teacher's bench or enough for every student group in the electricity lab. The quotation you receive sets out packing, delivery time and price for exactly that number, and other physics lab equipment in India, such as a multimeter, can share it.
Science Lab Supplies is a registered exporter holding an Importer-Exporter Code, so it can ship to buyers in Zambia, Rwanda, South Africa, Qatar, Sri Lanka and Vietnam. The business is registered under Udyam as a manufacturing enterprise (UDYAM-HR-01-0014546) and for GST (GSTIN 06ADEPJ0574F2ZU). Electricity-lab lists that include this box can be sent from the contact page or built in the enquiry cart, and tender paperwork is handled through the lab tender page.
Frequently Asked Questions
How accurate are the resistor values?
The resistors have a 5% tolerance. Individual resistors can sit closer to their nominal value, so students should measure the selected resistance with a meter when a practical needs the exact figure.
Why are the terminals yellow?
The two 4 mm terminals are yellow to show that the connection is non-polar: a resistor has no positive or negative end, so the box can be connected either way round in the circuit.
Is Science Lab Supplies the manufacturer or a trader?
This switched box is assembled by Science Lab Supplies at its Saha, Ambala factory in India, which makes the company its manufacturer, and each quotation for it is prepared at the factory rather than by a trading house.
How much power can each resistor take?
Every resistor in the box has a maximum power rating of 1 W. Choose the supply voltage so that the power in the selected resistor stays under that figure.
Related Resistance and Circuit Measurement Equipment
These seven items share the substitution box's job of setting or measuring circuit values on the bench. Together they let a class switch, dial or clamp in resistance and capacitance, control current and check each result with a meter, and all of them can be listed on one quotation.
- Capacitance Substitution Box — capacitors from 100 pF to 1 µF behind a rotary selector, 5% accuracy and 63 V ratings, in an ABS case.
- Resistance Substitution Box (24-step) — values from 10 Ω to 1 MΩ in 24 steps, all 5% tolerance and 1/2 W.
- Resistance Box — resistance dialled up in decades, each step dissipating 1 W, with 4 mm spin-free terminals.
- Decade Resistance Box, Dial Type — high-stability 1% metal film elements for AC or DC use, in two-, three- and four-dial versions.
- Resistor Element Set with Holders/Clamps — 1 Ω, 2 Ω, 10 Ω, 100 Ω and 1 kΩ metal film resistors with clamp-type holders.
- Digital Multimeter — voltage, current and resistance ranges plus diode and continuity tests.
- Rheostat — 10 Ω high-power rheostat, up to 5.7 A constant current, with 4 mm safety sockets.
Browse the full Physics Lab range, the Electrical and Electronics range for decade boxes and bridges, or all physics lab equipment.
Last updated: 22 October 2026
