We ship to the Philippines — door-to-door, customs and logistics handled by 3G Electric

MERSEN Rupture Disc with Bar Support: 20 psig Burst Pressure, 4 in Compatible Pipe Size - Rupture Discs
MERSENRupture Discs

MERSEN Rupture Disc with Bar Support: 20 psig Burst Pressure, 4 in Compatible Pipe Size

The MERSEN Rupture Disc with Bar Support (MPN S3-04-20B) is a graphite-bodied overpressure safety device designed for 4-inch pipe systems. It is factory-set to burst at 20 psig, providing a precise pressure-relief…

SKU 3G-OTH-440489

Also listed as: S30420B · S3 04 20B

Brand
MERSEN
Item
Rupture Disc with Bar Support: 20 psig Burst Pressure, 4 in Compatible Pipe Size
Category
Rupture Discs
Available to Order
Trade pricing by quote — replies within 24h
Qty
WhatsApp an engineerMessage via Telegram
No account needed — your quote request goes straight to our engineers. A free account lets you track quotes and re-order faster.
Worldwide Shipping
Air & sea freight
Datasheet on Request
Technical specs
1-Day Quote
Replies within 24h

Local availability & support — the Philippines

Delivery
5–8 business days door-to-door; Bureau of Customs clearance typically 2–4 business days.
Payment
Invoicing in PHP or USD. Bank transfer and corporate PO accepted.
Ships to
Manila, Quezon City, Cebu, Davao, Batangas

Technical Specifications

MERSEN
Manufacturer Part Number
S3-04-20B
Type
Graphite
Body Material
Graphite
Compatible Pipe Size
4 in

Technical Documents

No technical documents available for this product.
Request documentation
Not sure this is the right part? Get a recommendation.

Need installation or engineering help?

Installation, commissioning, maintenance plans, system design, and bundled product + service quotes — one team handles the full scope.
Talk to an engineer

Ask a question

MERSEN Products
3G Electric (S) Pte. Ltd. — Singapore

Product Description

The MERSEN Rupture Disc with Bar Support (MPN S3-04-20B) is a graphite-bodied overpressure safety device designed for 4-inch pipe systems. It is factory-set to burst at 20 psig, providing a precise pressure-relief threshold. This disc is constructed with a graphite body and includes a bar support for structural integrity.

Supplied to the Philippines — compatible with 60 Hz installations. DHL Express delivery to Manila, Quezon City, Cebu, customs and duties handled door-to-door.

Frequently Asked Questions

What is a MERSEN rupture disc with bar support used for?

A MERSEN rupture disc with bar support is an overpressure safety device that protects piping systems and vessels from excessive pressure. It provides a precise, factory-set burst threshold at 20 psig for 4-inch pipe systems, ensuring reliable pressure relief in industrial processes.

What are the specifications of the MERSEN S3-04-20B rupture disc?

The MERSEN S3-04-20B rupture disc features a graphite body with bar support, a compatible pipe size of 4 in, and a factory-set burst pressure of 20 psig. It is designed for overpressure protection in industrial applications requiring a precise, non-reclosing relief device.

Where to buy MERSEN rupture discs worldwide?

3G Electric supplies MERSEN rupture discs worldwide, handling full logistics and customs clearance for global delivery. As a sourcing partner, we provide genuine MERSEN parts like the S3-04-20B graphite disc with bar support, ensuring you receive the correct overpressure safety device for your system.

How to select a MERSEN rupture disc for a 4-inch pipe?

To select a MERSEN rupture disc for a 4-inch pipe, match the pipe size and required burst pressure. The S3-04-20B is factory-set at 20 psig with a graphite body and bar support. Always verify system operating conditions and consult a safety engineer to ensure the disc's burst rating aligns with your pressure relief requirements.

Used in

Common applications for MERSEN
Power electronics protection — MERSEN A70Q series semiconductor fuses in variable frequency drives for motor control.
Surge protection for industrial panels — MERSEN STP480D07 SPDs in three-phase 480V AC distribution boards.
Control circuit overcurrent protection — MERSEN ATM series midget fuses in PLC and instrumentation cabinets.
Power distribution in manufacturing — MERSEN FSPDB4A finger-safe blocks in motor control centers for wire management.
DC bus protection in renewable energy — MERSEN A30QS series fuses in solar inverter DC inputs.
High-voltage semiconductor protection — MERSEN A70Q series fuses in welding equipment power supplies.

MERSEN Products

3G Electric supplies MERSEN rupture discs. We supply genuine products with in-stock availability on common SKUs, technical documentation, commissioning support, and warranty service — worldwide.

You might also need

Burners & Combustion Pumps & Compressors Spare Parts All Products

Compatible alternatives & equivalents

Cross-referenced by specification & description
MERSEN Rupture Disc with Bar Support: 20 psig Burst Pressure, 6 in Compatible Pipe Size, Graphite (MPN S3-06-20B)
MERSEN
MERSEN Rupture Disc with Bar Support: 20 psig Burst Pressure, 6 in Compatible Pipe Size, Graphite (MPN S3-06-20B)
MERSEN Rupture Disc with Bar Support: 20 psig Burst Pressure, 3 in Compatible Pipe Size, Graphite (MPN S3-03-20B)
MERSEN
MERSEN Rupture Disc with Bar Support: 20 psig Burst Pressure, 3 in Compatible Pipe Size, Graphite (MPN S3-03-20B)
MERSEN Rupture Disc: 100 psig Burst Pressure, 4 in Compatible Pipe Size, 6 3/10 in Overall Dia (MPN S3-04-100)
MERSEN
MERSEN Rupture Disc: 100 psig Burst Pressure, 4 in Compatible Pipe Size, 6 3/10 in Overall Dia (MPN S3-04-100)
MERSEN Rupture Disc: 150 psig Burst Pressure, 4 in Compatible Pipe Size, 6 3/10 in Overall Dia (MPN S3-04-150)
MERSEN
MERSEN Rupture Disc: 150 psig Burst Pressure, 4 in Compatible Pipe Size, 6 3/10 in Overall Dia (MPN S3-04-150)
MERSEN Rupture Disc: 75 psig Burst Pressure, 4 in Compatible Pipe Size, 6 3/10 in Overall Dia (MPN S3-04-75)
MERSEN
MERSEN Rupture Disc: 75 psig Burst Pressure, 4 in Compatible Pipe Size, 6 3/10 in Overall Dia (MPN S3-04-75)
MERSEN Rupture Disc: 40 psig Burst Pressure, 4 in Compatible Pipe Size, 6 3/10 in Overall Dia (MPN S3-04-40)
MERSEN
MERSEN Rupture Disc: 40 psig Burst Pressure, 4 in Compatible Pipe Size, 6 3/10 in Overall Dia (MPN S3-04-40)

More from MERSEN

View all MERSEN parts
Graphite rupture disc with bar support for overpressure protection in piping systems. Compatible with 2-inch pipe size, rated for 20 psig burst pressure. Body material is graphite
MERSEN
Graphite rupture disc with bar support for overpressure protection in piping systems. Compatible with 2-inch pipe size, rated for 20 psig burst pressure. Body material is graphite
Graphite rupture disc with 30 psig burst pressure for 4-inch pipe systems. Overall diameter 6 3/10 inches. Provides overpressure protection in industrial piping applications
MERSEN
Graphite rupture disc with 30 psig burst pressure for 4-inch pipe systems. Overall diameter 6 3/10 inches. Provides overpressure protection in industrial piping applications
Graphite rupture disc with 40 psig burst pressure for 2-inch compatible pipe size. Overall diameter 3 9/10 inches. Provides overpressure protection in industrial piping systems
MERSEN
Graphite rupture disc with 40 psig burst pressure for 2-inch compatible pipe size. Overall diameter 3 9/10 inches. Provides overpressure protection in industrial piping systems
Graphite rupture disc with 20 psig burst pressure for 6-inch compatible pipe size. Overall diameter 8 1/2 inches. Provides overpressure protection in industrial piping systems
MERSEN
Graphite rupture disc with 20 psig burst pressure for 6-inch compatible pipe size. Overall diameter 8 1/2 inches. Provides overpressure protection in industrial piping systems
Graphite rupture disc with 150 psig burst pressure for overpressure protection in industrial piping systems. Compatible with 2-inch pipe size, overall diameter 3 9/10 inches. Body material is graphite
MERSEN
Graphite rupture disc with 150 psig burst pressure for overpressure protection in industrial piping systems. Compatible with 2-inch pipe size, overall diameter 3 9/10 inches. Body material is graphite
Graphite rupture disc with 30 psig burst pressure for overpressure protection in piping systems. Compatible with 6-inch pipe size, overall diameter 8 1/2 inches. Body material is graphite
MERSEN
Graphite rupture disc with 30 psig burst pressure for overpressure protection in piping systems. Compatible with 6-inch pipe size, overall diameter 8 1/2 inches. Body material is graphite
Graphite rupture disc with 40 psig burst pressure for 6-inch compatible pipe size. Overall diameter 8 1/2 inches. Provides overpressure protection in industrial piping systems
MERSEN
Graphite rupture disc with 40 psig burst pressure for 6-inch compatible pipe size. Overall diameter 8 1/2 inches. Provides overpressure protection in industrial piping systems
Graphite rupture disc with 50 psig burst pressure for 4-inch compatible pipe size. Overall diameter 6 3/10 inches. Used for overpressure protection in piping systems
MERSEN
Graphite rupture disc with 50 psig burst pressure for 4-inch compatible pipe size. Overall diameter 6 3/10 inches. Used for overpressure protection in piping systems