SATURN Series Seismic Switch in NEMA 4 enclosure with front-panel Test/Reset switch, key lock and sealed cable entries

SATURN Series Seismic Switch

SATURN Series Seismic Switch: a tri-axial digital solid-state seismic sensor with Low and High seismic alarm outputs on dry, isolated relay contacts, for industrial, commercial and institutional earthquake shutdown and alarm systems. Choose the UL-listed SATURN S-001 (cULus) with internal battery and 110/220 Vac power adapter, or the SATURN-EB for 24 Vdc PLC-powered low-voltage installations. From $4,756.50 USD, ex-works; select the model and options below to see your configuration price.

Price range: $4,756.50 through $13,602.75

Prices in USD, ex-works. Freight and export documentation extra. Sensors are sold only as part of a complete system.

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OVERVIEW

The SATURN Series Seismic Switch is a self-contained earthquake detection and control device that watches ground motion around the clock and operates relay contacts the moment shaking exceeds a user-set level. A maintenance-free tri-axial digital solid-state sensor measures acceleration on three orthogonal axes (X, Y and Z), detects both the vertical P-wave and the horizontal S-wave, and drives Low and High seismic alarm outputs through dry, isolated relay contacts, plus a common fault alarm. It is built for industrial, commercial and institutional seismic shutdown and alarm duty: process and motor shutdown, gas and utility isolation, elevator seismic recall, electronic doors, solenoids and personnel alarms through existing PA systems.

Trigger setpoints are user-selectable from 0.025 g to 0.5 g on each axis, the frequency response is programmable to 1–10 Hz or 1–15 Hz, and the trigger response is selectable for ASCE 25-97, ASME A17.1 and CA3137. After a trip the switch stores and displays the Peak Ground Acceleration (PGA) in g for each axis, so the event and the system’s performance can be reviewed over RS-232C or USB.

Two base models

  • SATURN S-001 (cULus) – Horizontal mount, NEMA 4 enclosure, internal battery back-up and 110/220 Vac power adapter. UL listed (cULus). Choose it for line-powered sites, UL-listed installations and wherever protection must continue through a power loss (more than one hour of battery reserve at maximum demand). $6,636.00 USD
  • SATURN-EB – Horizontal mount, NEMA 4 enclosure, 24 Vdc (10 W) external supply; no battery, no adapter. For non-UL low-voltage (under 50 V) applications: 24 Vdc from the owner's PLC, dry isolated relay contacts for signaling and control. Choose it when the switch is powered from a battery-backed PLC or control-panel DC supply and the alarm contacts simply signal the control system. $4,756.50 USD

Options

Choose the model and options in the selectors at the top of this page; the configuration price updates with every selection.

  • Vertical wall-mount configuration (+ $666.75) – Wall-mounted unit for sites where slab mounting is impractical. For wall-mount installations, multi-switch voting is recommended (see Application notes).
  • Stainless steel primary enclosure (+ $887.25) – Stainless steel housing in place of the standard primary enclosure.
  • Bypass switch (+ $829.50) – Factory-installed bypass switch.
  • Stainless steel secondary enclosure, NEMA 4X, 16 × 16 × 8 in (+ $3,123.75) – Factory machined with baseplate cutout and NEMA 4X vents. For installations where external DC power is supplied by the owner (SATURN-EB, or S-001 run on owner-supplied 12 Vdc without adapter or battery).
  • Stainless steel secondary enclosure, NEMA 4X, 24 × 24 × 12 in (+ $4,047.75) – Factory machined with baseplate cutout and NEMA 4X vents. Sized to fit a 110/220 Vac outlet for the S-001 power adapter.
  • Export packaging (+ $535.50) – Per unit. Packaging for trans-oceanic shipment or storage of up to one year.

Prices in USD, ex-works. Freight and export documentation extra. Sensors are sold only as part of a complete system.

The problem it solves

Simple mechanical or single-axis seismic triggers force a choice between sensitivity and nuisance trips: set them low and passing trucks, compressors or trains shut the plant down; set them high and real earthquakes are missed. The SATURN Series uses frequency-selective filtering to pass earthquake motion and reject industrial vibration from heavy equipment, trucks, compressors and trains, with proven performance next to rail lines and in factory environments. The result is a shutdown signal operators can trust and an acceleration record that documents what the site actually experienced.

Why choose the SATURN Series?

  • Detects the whole earthquake. Tri-axial solid-state sensing covers vertical P-waves and horizontal S-waves on X, Y and Z, with no periodic sensor maintenance.
  • Matches your code requirement. Setpoints from 0.025 g to 0.5 g per axis with ASCE 25-97, ASME A17.1 and CA3137 selectable response.
  • Immune to industrial vibration. Frequency-selective filtering rejects truck, compressor, heavy-equipment and train vibration that would trip simpler switches.
  • Low and High alarms plus fault alarm. Three independently programmable Form C relays with dry, isolated contacts rated 4 A @ 250 VAC.
  • Evidence after every trip. Peak Ground Acceleration is stored for each axis and recovered over RS-232C or USB.
  • A model for every power architecture. UL-listed S-001 with battery and 110/220 Vac adapter, or SATURN-EB for 24 Vdc PLC-powered low-voltage systems.
  • Safe to test and reset. NEC Electrical Code compliant front-panel Test/Reset keeps the operator clear of electrical circuits; Power-On Self-Test and diagnostic commands confirm the unit is healthy.
  • Ready to install, ready to protect. NEMA 4 primary enclosure with sealed cable and conduit entry, internal terminal block, and factory-machined stainless NEMA 4X secondary enclosures as priced options.

Why buy from QuakeLogic?

QuakeLogic Inc. is a California-based engineering and technology company that supplies seismic switches, earthquake early warning systems, accelerographs and structural monitoring solutions. Our engineers help you select the model, setpoint and response standard, decide between slab and wall mounting, size the secondary enclosure, plan relay wiring into your PLC or elevator controller, and design 2-out-of-2 or 2-out-of-3 voting for critical facilities. Published prices are QuakeLogic list prices in USD, ex-works; request a quote for freight and delivery.

Application notes

  • Secondary enclosure. A secondary enclosure is highly recommended for single-switch sites; it prevents false alarms caused by dropped tools or incidental contact with the switch.
  • Voting for critical sites and wall-mount installations. For critical sites or wall-mount installs, 2-out-of-2 or 2-out-of-3 voting between multiple switches is recommended, with sensors spaced roughly 30–100 ft apart and the alarms landed on hard-interrupt (non-masked) PLC inputs.
  • Relay loads. The alarm contacts are dry, isolated Form C contacts rated 4 A @ 250 VAC; drive motor starters, valves and elevator controllers through their own control inputs or interposing relays.
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PRODUCT PHOTOS

SPECIFICATIONS

Sensor:

Tri-axial digital solid-state accelerometer, three orthogonal axes (X, Y, Z); detects vertical P-wave and horizontal S-wave acceleration

Trigger Setpoints:

0.025 g to 0.5 g per axis, user-selectable

Frequency Response:

1–10 Hz or 1–15 Hz, as programmed; filters non-earthquake industrial vibration

Response Standards:

ASCE 25-97, ASME A17.1 and CA3137 selectable

Alarm Outputs:

Low and High seismic alarms plus common fault alarm on three programmable Form C dry, isolated relays, 4 A @ 250 VAC

Trip Mode:

Latched (manual reset) or momentary, 1 to 60 s

Data Output:

Peak Ground Acceleration (PGA) in g per axis, stored and displayed when triggered

Communications & Diagnostics:

RS-232C serial (3-wire) or USB; terminal communication program supplied; Power-On Self-Test (POST) and diagnostic commands

Power – SATURN S-001 (cULus):

110/220 Vac power adapter with internal rechargeable 12 Vdc, 1.2 Ah battery; 1+ hr reserve at maximum demand; UL listed

Power – SATURN-EB:

24 Vdc (10 W) from the owner's PLC or DC supply; no battery, no adapter; for non-UL low-voltage (<50 V) applications

Enclosure & Mounting:

NEMA 4 primary enclosure, 8 × 8 × 5 in, 9 lb (19 lb with mounting plate); horizontal slab mount with four ¼ in bolts; options: stainless primary, NEMA 4X stainless secondary (16 × 16 × 8 or 24 × 24 × 12 in), vertical wall-mount, bypass switch

Environment & Compliance:

−20 to +70 °C; 0–95% humidity, non-condensing; S-001 UL listed (cULus); NEC Electrical Code compliant Test/Reset

FEATURES

Maintenance-free tri-axial digital solid-state accelerometer detects vertical P-waves and horizontal S-waves on the X, Y and Z axes.
Low and High seismic alarm outputs on dry, isolated Form C relay contacts (4 A @ 250 VAC) plus a common fault alarm relay.
User-selectable trigger setpoints from 0.025 g to 0.5 g per axis with ASCE 25-97, ASME A17.1 and CA3137 selectable response.
Frequency-selective filtering (1–10 Hz or 1–15 Hz) rejects truck, compressor, heavy-equipment and train vibration; proven next to rail lines and in factories.
Latched trip with manual front-panel reset, or momentary trip from 1 to 60 seconds with automatic reset.
Stores and displays Peak Ground Acceleration (PGA) in g on each axis after every seismic trip for system performance review.
Two base models: UL-listed SATURN S-001 (cULus) with internal battery and 110/220 Vac adapter, or SATURN-EB for 24 Vdc (10 W) PLC-powered low-voltage systems.
NEMA 4 primary enclosure with sealed cable and conduit entry and internal terminal block; stainless primary and NEMA 4X secondary enclosures, vertical wall-mount and bypass switch available as priced options.
Two base models: UL-listed SATURN S-001 (cULus) with internal battery and 110/220 Vac adapter, or SATURN-EB for 24 Vdc (10 W) PLC-powered low-voltage systems.
NEMA 4 primary enclosure with sealed cable and conduit entry and internal terminal block; stainless primary and NEMA 4X secondary enclosures, vertical wall-mount and bypass switch available as priced options.

FAQs

What is the SATURN Series Seismic Switch and what does it do?
The SATURN Series Seismic Switch is a tri-axial digital solid-state seismic sensor with Low and High seismic alarm outputs on dry, isolated relay contacts. It monitors ground motion 24/7 and, when earthquake shaking exceeds the user-set threshold, operates its relays to shut down industrial processes, motors, gas and utility valves, elevators and doors or to sound personnel alarms in industrial, commercial and institutional facilities. After a trip it stores and displays the Peak Ground Acceleration (PGA) in g for each axis.
What is the difference between SATURN S-001 (cULus) and SATURN-EB, and which should I choose?
The SATURN S-001 (cULus) is the UL-listed model with an internal battery and a 110/220 Vac power adapter, so protection continues for more than an hour if line power fails; choose it for line-powered sites and installations that require a UL-listed switch. The SATURN-EB has no battery or adapter and runs on 24 Vdc (10 W) from the owner's PLC or control-panel supply; it is intended for non-UL low-voltage (under 50 V) applications where the dry isolated relay contacts simply signal the control system. QuakeLogic list prices are $6,636.00 for the S-001 and $4,756.50 for the SATURN-EB (USD, ex-works).
What trigger levels and standards does the SATURN Series support?
Trigger setpoints are user-selectable from 0.025 g to 0.5 g on each axis (X, Y and Z). The frequency response is programmable to 1–10 Hz or 1–15 Hz, and the trigger response is selectable for ASCE 25-97, ASME A17.1 and CA3137, so one switch can be matched to local requirements. The trip can be latched until manually reset or momentary for 1 to 60 seconds.
Will vibration from trucks, trains or machinery cause false trips, and do I need a secondary enclosure?
The switch uses frequency-selective filtering designed to make it immune to industrial vibration from heavy equipment, trucks, compressors and trains, with proven performance next to rail lines and in factories. A secondary enclosure is highly recommended for single-switch sites because it prevents false alarms caused by dropped tools or incidental contact with the switch; QuakeLogic offers factory-machined NEMA 4X stainless steel secondary enclosures in 16 × 16 × 8 in and 24 × 24 × 12 in sizes.
How should multiple switches be arranged for critical sites or wall-mount installations?
For critical sites or wall-mount installs, QuakeLogic recommends 2-out-of-2 or 2-out-of-3 voting between multiple switches, with the sensors spaced roughly 30–100 ft apart and the alarm contacts landed on hard-interrupt (non-masked) PLC inputs so that a shutdown requires agreement between units and cannot be missed by a scan cycle.
Which options are available and how is pricing structured?
Add-on options for either model are a vertical wall-mount configuration ($666.75), a stainless steel primary enclosure ($887.25), a bypass switch ($829.50), a 16 × 16 × 8 in NEMA 4X stainless secondary enclosure ($3,123.75, for owner-supplied DC power), a 24 × 24 × 12 in NEMA 4X stainless secondary enclosure ($4,047.75, sized for the S-001 power adapter outlet) and export packaging ($535.50 per unit). Prices in USD, ex-works. Freight and export documentation extra. Sensors are sold only as part of a complete system. Select the model and options on this page to see the configuration price, or request a quote from QuakeLogic.

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